ng $class CSS class or list of space-separated classes.
	 * @param array  $atts  Array of video shortcode attributes.
	 */
	$atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );

	$html_atts = array(
		'class'    => $atts['class'],
		'id'       => sprintf( 'video-%d-%d', $post_id, $instance ),
		'width'    => absint( $atts['width'] ),
		'height'   => absint( $atts['height'] ),
		'poster'   => esc_url( $atts['poster'] ),
		'loop'     => wp_validate_boolean( $atts['loop'] ),
		'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
		'muted'    => wp_validate_boolean( $atts['muted'] ),
		'preload'  => $atts['preload'],
	);

	// These ones should just be omitted altogether if they are blank.
	foreach ( array( 'poster', 'loop', 'autoplay', 'preload', 'muted' ) as $a ) {
		if ( empty( $html_atts[ $a ] ) ) {
			unset( $html_atts[ $a ] );
		}
	}

	$attr_strings = array();
	foreach ( $html_atts as $k => $v ) {
		$attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
	}

	$html = '';

	if ( 'mediaelement' === $library && 1 === $instance ) {
		$html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
	}

	$html .= sprintf( '<video %s controls="controls">', implode( ' ', $attr_strings ) );

	$fileurl = '';
	$source  = '<source type="%s" src="%s" />';

	foreach ( $default_types as $fallback ) {
		if ( ! empty( $atts[ $fallback ] ) ) {
			if ( empty( $fileurl ) ) {
				$fileurl = $atts[ $fallback ];
			}
			if ( 'src' === $fallback && $is_youtube ) {
				$type = array( 'type' => 'video/youtube' );
			} elseif ( 'src' === $fallback && $is_vimeo ) {
				$type = array( 'type' => 'video/vimeo' );
			} else {
				$type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
			}
			$url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
			$html .= sprintf( $source, $type['type'], esc_url( $url ) );
		}
	}

	if ( ! empty( $content ) ) {
		if ( str_contains( $content, "\n" ) ) {
			$content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
		}
		$html .= trim( $content );
	}

	if ( 'mediaelement' === $library ) {
		$html .= wp_mediaelement_fallback( $fileurl );
	}
	$html .= '</video>';

	$width_rule = '';
	if ( ! empty( $atts['width'] ) ) {
		$width_rule = sprintf( 'width: %dpx;', $atts['width'] );
	}
	$output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );

	/**
	 * Filters the output of the video shortcode.
	 *
	 * @since 3.6.0
	 *
	 * @param string $output  Video shortcode HTML output.
	 * @param array  $atts    Array of video shortcode attributes.
	 * @param string $video   Video file.
	 * @param int    $post_id Post ID.
	 * @param string $library Media library used for the video shortcode.
	 */
	return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
}
add_shortcode( 'video', 'wp_video_shortcode' );

/**
 * Gets the previous image link that has the same post parent.
 *
 * @since 5.8.0
 *
 * @see get_adjacent_image_link()
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 * @return string Markup for previous image link.
 */
function get_previous_image_link( $size = 'thumbnail', $text = false ) {
	return get_adjacent_image_link( true, $size, $text );
}

/**
 * Displays previous image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 */
function previous_image_link( $size = 'thumbnail', $text = false ) {
	echo get_previous_image_link( $size, $text );
}

/**
 * Gets the next image link that has the same post parent.
 *
 * @since 5.8.0
 *
 * @see get_adjacent_image_link()
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 * @return string Markup for next image link.
 */
function get_next_image_link( $size = 'thumbnail', $text = false ) {
	return get_adjacent_image_link( false, $size, $text );
}

/**
 * Displays next image link that has the same post parent.
 *
 * @since 2.5.0
 *
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param string|false $text Optional. Link text. Default false.
 */
function next_image_link( $size = 'thumbnail', $text = false ) {
	echo get_next_image_link( $size, $text );
}

/**
 * Gets the next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 5.8.0
 *
 * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $text Optional. Link text. Default false.
 * @return string Markup for image link.
 */
function get_adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
	$post        = get_post();
	$attachments = array_values(
		get_children(
			array(
				'post_parent'    => $post->post_parent,
				'post_status'    => 'inherit',
				'post_type'      => 'attachment',
				'post_mime_type' => 'image',
				'order'          => 'ASC',
				'orderby'        => 'menu_order ID',
			)
		)
	);

	foreach ( $attachments as $k => $attachment ) {
		if ( (int) $attachment->ID === (int) $post->ID ) {
			break;
		}
	}

	$output        = '';
	$attachment_id = 0;

	if ( $attachments ) {
		$k = $prev ? $k - 1 : $k + 1;

		if ( isset( $attachments[ $k ] ) ) {
			$attachment_id = $attachments[ $k ]->ID;
			$attr          = array( 'alt' => get_the_title( $attachment_id ) );
			$output        = wp_get_attachment_link( $attachment_id, $size, true, false, $text, $attr );
		}
	}

	$adjacent = $prev ? 'previous' : 'next';

	/**
	 * Filters the adjacent image link.
	 *
	 * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
	 * either 'next', or 'previous'.
	 *
	 * Possible hook names include:
	 *
	 *  - `next_image_link`
	 *  - `previous_image_link`
	 *
	 * @since 3.5.0
	 *
	 * @param string $output        Adjacent image HTML markup.
	 * @param int    $attachment_id Attachment ID
	 * @param string|int[] $size    Requested image size. Can be any registered image size name, or
	 *                              an array of width and height values in pixels (in that order).
	 * @param string $text          Link text.
	 */
	return apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
}

/**
 * Displays next or previous image link that has the same post parent.
 *
 * Retrieves the current attachment object from the $post global.
 *
 * @since 2.5.0
 *
 * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
 * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 *                           of width and height values in pixels (in that order). Default 'thumbnail'.
 * @param bool         $text Optional. Link text. Default false.
 */
function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
	echo get_adjacent_image_link( $prev, $size, $text );
}

/**
 * Retrieves taxonomies attached to given the attachment.
 *
 * @since 2.5.0
 * @since 4.7.0 Introduced the `$output` parameter.
 *
 * @param int|array|object $attachment Attachment ID, data array, or data object.
 * @param string           $output     Output type. 'names' to return an array of taxonomy names,
 *                                     or 'objects' to return an array of taxonomy objects.
 *                                     Default is 'names'.
 * @return string[]|WP_Taxonomy[] List of taxonomies or taxonomy names. Empty array on failure.
 */
function get_attachment_taxonomies( $attachment, $output = 'names' ) {
	if ( is_int( $attachment ) ) {
		$attachment = get_post( $attachment );
	} elseif ( is_array( $attachment ) ) {
		$attachment = (object) $attachment;
	}

	if ( ! is_object( $attachment ) ) {
		return array();
	}

	$file     = get_attached_file( $attachment->ID );
	$filename = wp_basename( $file );

	$objects = array( 'attachment' );

	if ( str_contains( $filename, '.' ) ) {
		$objects[] = 'attachment:' . substr( $filename, strrpos( $filename, '.' ) + 1 );
	}

	if ( ! empty( $attachment->post_mime_type ) ) {
		$objects[] = 'attachment:' . $attachment->post_mime_type;

		if ( str_contains( $attachment->post_mime_type, '/' ) ) {
			foreach ( explode( '/', $attachment->post_mime_type ) as $token ) {
				if ( ! empty( $token ) ) {
					$objects[] = "attachment:$token";
				}
			}
		}
	}

	$taxonomies = array();

	foreach ( $objects as $object ) {
		$taxes = get_object_taxonomies( $object, $output );

		if ( $taxes ) {
			$taxonomies = array_merge( $taxonomies, $taxes );
		}
	}

	if ( 'names' === $output ) {
		$taxonomies = array_unique( $taxonomies );
	}

	return $taxonomies;
}

/**
 * Retrieves all of the taxonomies that are registered for attachments.
 *
 * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
 *
 * @since 3.5.0
 *
 * @see get_taxonomies()
 *
 * @param string $output Optional. The type of taxonomy output to return. Accepts 'names' or 'objects'.
 *                       Default 'names'.
 * @return string[]|WP_Taxonomy[] Array of names or objects of registered taxonomies for attachments.
 */
function get_taxonomies_for_attachments( $output = 'names' ) {
	$taxonomies = array();

	foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
		foreach ( $taxonomy->object_type as $object_type ) {
			if ( 'attachment' === $object_type || str_starts_with( $object_type, 'attachment:' ) ) {
				if ( 'names' === $output ) {
					$taxonomies[] = $taxonomy->name;
				} else {
					$taxonomies[ $taxonomy->name ] = $taxonomy;
				}
				break;
			}
		}
	}

	return $taxonomies;
}

/**
 * Determines whether the value is an acceptable type for GD image functions.
 *
 * In PHP 8.0, the GD extension uses GdImage objects for its data structures.
 * This function checks if the passed value is either a GdImage object instance
 * or a resource of type `gd`. Any other type will return false.
 *
 * @since 5.6.0
 *
 * @param resource|GdImage|false $image A value to check the type for.
 * @return bool True if `$image` is either a GD image resource or a GdImage instance,
 *              false otherwise.
 */
function is_gd_image( $image ) {
	if ( $image instanceof GdImage
		|| is_resource( $image ) && 'gd' === get_resource_type( $image )
	) {
		return true;
	}

	return false;
}

/**
 * Creates a new GD image resource with transparency support.
 *
 * @todo Deprecate if possible.
 *
 * @since 2.9.0
 *
 * @param int $width  Image width in pixels.
 * @param int $height Image height in pixels.
 * @return resource|GdImage|false The GD image resource or GdImage instance on success.
 *                                False on failure.
 */
function wp_imagecreatetruecolor( $width, $height ) {
	$img = imagecreatetruecolor( $width, $height );

	if ( is_gd_image( $img )
		&& function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' )
	) {
		imagealphablending( $img, false );
		imagesavealpha( $img, true );
	}

	return $img;
}

/**
 * Based on a supplied width/height example, returns the biggest possible dimensions based on the max width/height.
 *
 * @since 2.9.0
 *
 * @see wp_constrain_dimensions()
 *
 * @param int $example_width  The width of an example embed.
 * @param int $example_height The height of an example embed.
 * @param int $max_width      The maximum allowed width.
 * @param int $max_height     The maximum allowed height.
 * @return int[] {
 *     An array of maximum width and height values.
 *
 *     @type int $0 The maximum width in pixels.
 *     @type int $1 The maximum height in pixels.
 * }
 */
function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
	$example_width  = (int) $example_width;
	$example_height = (int) $example_height;
	$max_width      = (int) $max_width;
	$max_height     = (int) $max_height;

	return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
}

/**
 * Determines the maximum upload size allowed in php.ini.
 *
 * @since 2.5.0
 *
 * @return int Allowed upload size.
 */
function wp_max_upload_size() {
	$u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
	$p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );

	/**
	 * Filters the maximum upload size allowed in php.ini.
	 *
	 * @since 2.5.0
	 *
	 * @param int $size    Max upload size limit in bytes.
	 * @param int $u_bytes Maximum upload filesize in bytes.
	 * @param int $p_bytes Maximum size of POST data in bytes.
	 */
	return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
}

/**
 * Returns a WP_Image_Editor instance and loads file into it.
 *
 * @since 3.5.0
 *
 * @param string $path Path to the file to load.
 * @param array  $args Optional. Additional arguments for retrieving the image editor.
 *                     Default empty array.
 * @return WP_Image_Editor|WP_Error The WP_Image_Editor object on success,
 *                                  a WP_Error object otherwise.
 */
function wp_get_image_editor( $path, $args = array() ) {
	$args['path'] = $path;

	// If the mime type is not set in args, try to extract and set it from the file.
	if ( ! isset( $args['mime_type'] ) ) {
		$file_info = wp_check_filetype( $args['path'] );

		/*
		 * If $file_info['type'] is false, then we let the editor attempt to
		 * figure out the file type, rather than forcing a failure based on extension.
		 */
		if ( isset( $file_info ) && $file_info['type'] ) {
			$args['mime_type'] = $file_info['type'];
		}
	}

	// Check and set the output mime type mapped to the input type.
	if ( isset( $args['mime_type'] ) ) {
		/** This filter is documented in wp-includes/class-wp-image-editor.php */
		$output_format = apply_filters( 'image_editor_output_format', array(), $path, $args['mime_type'] );
		if ( isset( $output_format[ $args['mime_type'] ] ) ) {
			$args['output_mime_type'] = $output_format[ $args['mime_type'] ];
		}
	}

	$implementation = _wp_image_editor_choose( $args );

	if ( $implementation ) {
		$editor = new $implementation( $path );
		$loaded = $editor->load();

		if ( is_wp_error( $loaded ) ) {
			return $loaded;
		}

		return $editor;
	}

	return new WP_Error( 'image_no_editor', __( 'No editor could be selected.' ) );
}

/**
 * Tests whether there is an editor that supports a given mime type or methods.
 *
 * @since 3.5.0
 *
 * @param string|array $args Optional. Array of arguments to retrieve the image editor supports.
 *                           Default empty array.
 * @return bool True if an eligible editor is found; false otherwise.
 */
function wp_image_editor_supports( $args = array() ) {
	return (bool) _wp_image_editor_choose( $args );
}

/**
 * Tests which editors are capable of supporting the request.
 *
 * @ignore
 * @since 3.5.0
 *
 * @param array $args Optional. Array of arguments for choosing a capable editor. Default empty array.
 * @return string|false Class name for the first editor that claims to support the request.
 *                      False if no editor claims to support the request.
 */
function _wp_image_editor_choose( $args = array() ) {
	require_once ABSPATH . WPINC . '/class-wp-image-editor.php';
	require_once ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
	require_once ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';
	require_once ABSPATH . WPINC . '/class-avif-info.php';
	/**
	 * Filters the list of image editing library classes.
	 *
	 * @since 3.5.0
	 *
	 * @param string[] $image_editors Array of available image editor class names. Defaults are
	 *                                'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
	 */
	$implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );
	$supports_input  = false;

	foreach ( $implementations as $implementation ) {
		if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) {
			continue;
		}

		// Implementation should support the passed mime type.
		if ( isset( $args['mime_type'] ) &&
			! call_user_func(
				array( $implementation, 'supports_mime_type' ),
				$args['mime_type']
			) ) {
			continue;
		}

		// Implementation should support requested methods.
		if ( isset( $args['methods'] ) &&
			array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {

			continue;
		}

		// Implementation should ideally support the output mime type as well if set and different than the passed type.
		if (
			isset( $args['mime_type'] ) &&
			isset( $args['output_mime_type'] ) &&
			$args['mime_type'] !== $args['output_mime_type'] &&
			! call_user_func( array( $implementation, 'supports_mime_type' ), $args['output_mime_type'] )
		) {
			/*
			 * This implementation supports the input type but not the output type.
			 * Keep looking to see if we can find an implementation that supports both.
			 */
			$supports_input = $implementation;
			continue;
		}

		// Favor the implementation that supports both input and output mime types.
		return $implementation;
	}

	return $supports_input;
}

/**
 * Prints default Plupload arguments.
 *
 * @since 3.4.0
 */
function wp_plupload_default_settings() {
	$wp_scripts = wp_scripts();

	$data = $wp_scripts->get_data( 'wp-plupload', 'data' );
	if ( $data && str_contains( $data, '_wpPluploadSettings' ) ) {
		return;
	}

	$max_upload_size    = wp_max_upload_size();
	$allowed_extensions = array_keys( get_allowed_mime_types() );
	$extensions         = array();
	foreach ( $allowed_extensions as $extension ) {
		$extensions = array_merge( $extensions, explode( '|', $extension ) );
	}

	/*
	 * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
	 * and the `flash_swf_url` and `silverlight_xap_url` are not used.
	 */
	$defaults = array(
		'file_data_name' => 'async-upload', // Key passed to $_FILE.
		'url'            => admin_url( 'async-upload.php', 'relative' ),
		'filters'        => array(
			'max_file_size' => $max_upload_size . 'b',
			'mime_types'    => array( array( 'extensions' => implode( ',', $extensions ) ) ),
		),
	);

	/*
	 * Currently only iOS Safari supports multiple files uploading,
	 * but iOS 7.x has a bug that prevents uploading of videos when enabled.
	 * See #29602.
	 */
	if ( wp_is_mobile()
		&& str_contains( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' )
		&& str_contains( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' )
	) {
		$defaults['multi_selection'] = false;
	}

	// Check if WebP images can be edited.
	if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
		$defaults['webp_upload_error'] = true;
	}

	// Check if AVIF images can be edited.
	if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/avif' ) ) ) {
		$defaults['avif_upload_error'] = true;
	}

	/**
	 * Filters the Plupload default settings.
	 *
	 * @since 3.4.0
	 *
	 * @param array $defaults Default Plupload settings array.
	 */
	$defaults = apply_filters( 'plupload_default_settings', $defaults );

	$params = array(
		'action' => 'upload-attachment',
	);

	/**
	 * Filters the Plupload default parameters.
	 *
	 * @since 3.4.0
	 *
	 * @param array $params Default Plupload parameters array.
	 */
	$params = apply_filters( 'plupload_default_params', $params );

	$params['_wpnonce'] = wp_create_nonce( 'media-form' );

	$defaults['multipart_params'] = $params;

	$settings = array(
		'defaults'      => $defaults,
		'browser'       => array(
			'mobile'    => wp_is_mobile(),
			'supported' => _device_can_upload(),
		),
		'limitExceeded' => is_multisite() && ! is_upload_space_available(),
	);

	$script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';

	if ( $data ) {
		$script = "$data\n$script";
	}

	$wp_scripts->add_data( 'wp-plupload', 'data', $script );
}

/**
 * Prepares an attachment post object for JS, where it is expected
 * to be JSON-encoded and fit into an Attachment model.
 *
 * @since 3.5.0
 *
 * @param int|WP_Post $attachment Attachment ID or object.
 * @return array|void {
 *     Array of attachment details, or void if the parameter does not correspond to an attachment.
 *
 *     @type string $alt                   Alt text of the attachment.
 *     @type string $author                ID of the attachment author, as a string.
 *     @type string $authorName            Name of the attachment author.
 *     @type string $caption               Caption for the attachment.
 *     @type array  $compat                Containing item and meta.
 *     @type string $context               Context, whether it's used as the site icon for example.
 *     @type int    $date                  Uploaded date, timestamp in milliseconds.
 *     @type string $dateFormatted         Formatted date (e.g. June 29, 2018).
 *     @type string $description           Description of the attachment.
 *     @type string $editLink              URL to the edit page for the attachment.
 *     @type string $filename              File name of the attachment.
 *     @type string $filesizeHumanReadable Filesize of the attachment in human readable format (e.g. 1 MB).
 *     @type int    $filesizeInBytes       Filesize of the attachment in bytes.
 *     @type int    $height                If the attachment is an image, represents the height of the image in pixels.
 *     @type string $icon                  Icon URL of the attachment (e.g. /wp-includes/images/media/archive.png).
 *     @type int    $id                    ID of the attachment.
 *     @type string $link                  URL to the attachment.
 *     @type int    $menuOrder             Menu order of the attachment post.
 *     @type array  $meta                  Meta data for the attachment.
 *     @type string $mime                  Mime type of the attachment (e.g. image/jpeg or application/zip).
 *     @type int    $modified              Last modified, timestamp in milliseconds.
 *     @type string $name                  Name, same as title of the attachment.
 *     @type array  $nonces                Nonces for update, delete and edit.
 *     @type string $orientation           If the attachment is an image, represents the image orientation
 *                                         (landscape or portrait).
 *     @type array  $sizes                 If the attachment is an image, contains an array of arrays
 *                                         for the images sizes: thumbnail, medium, large, and full.
 *     @type string $status                Post status of the attachment (usually 'inherit').
 *     @type string $subtype               Mime subtype of the attachment (usually the last part, e.g. jpeg or zip).
 *     @type string $title                 Title of the attachment (usually slugified file name without the extension).
 *     @type string $type                  Type of the attachment (usually first part of the mime type, e.g. image).
 *     @type int    $uploadedTo            Parent post to which the attachment was uploaded.
 *     @type string $uploadedToLink        URL to the edit page of the parent post of the attachment.
 *     @type string $uploadedToTitle       Post title of the parent of the attachment.
 *     @type string $url                   Direct URL to the attachment file (from wp-content).
 *     @type int    $width                 If the attachment is an image, represents the width of the image in pixels.
 * }
 *
 */
function wp_prepare_attachment_for_js( $attachment ) {
	$attachment = get_post( $attachment );

	if ( ! $attachment ) {
		return;
	}

	if ( 'attachment' !== $attachment->post_type ) {
		return;
	}

	$meta = wp_get_attachment_metadata( $attachment->ID );
	if ( str_contains( $attachment->post_mime_type, '/' ) ) {
		list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
	} else {
		list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
	}

	$attachment_url = wp_get_attachment_url( $attachment->ID );
	$base_url       = str_replace( wp_basename( $attachment_url ), '', $attachment_url );

	$response = array(
		'id'            => $attachment->ID,
		'title'         => $attachment->post_title,
		'filename'      => wp_basename( get_attached_file( $attachment->ID ) ),
		'url'           => $attachment_url,
		'link'          => get_attachment_link( $attachment->ID ),
		'alt'           => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
		'author'        => $attachment->post_author,
		'description'   => $attachment->post_content,
		'caption'       => $attachment->post_excerpt,
		'name'          => $attachment->post_name,
		'status'        => $attachment->post_status,
		'uploadedTo'    => $attachment->post_parent,
		'date'          => strtotime( $attachment->post_date_gmt ) * 1000,
		'modified'      => strtotime( $attachment->post_modified_gmt ) * 1000,
		'menuOrder'     => $attachment->menu_order,
		'mime'          => $attachment->post_mime_type,
		'type'          => $type,
		'subtype'       => $subtype,
		'icon'          => wp_mime_type_icon( $attachment->ID, '.svg' ),
		'dateFormatted' => mysql2date( __( 'F j, Y' ), $attachment->post_date ),
		'nonces'        => array(
			'update' => false,
			'delete' => false,
			'edit'   => false,
		),
		'editLink'      => false,
		'meta'          => false,
	);

	$author = new WP_User( $attachment->post_author );

	if ( $author->exists() ) {
		$author_name            = $author->display_name ? $author->display_name : $author->nickname;
		$response['authorName'] = html_entity_decode( $author_name, ENT_QUOTES, get_bloginfo( 'charset' ) );
		$response['authorLink'] = get_edit_user_link( $author->ID );
	} else {
		$response['authorName'] = __( '(no author)' );
	}

	if ( $attachment->post_parent ) {
		$post_parent = get_post( $attachment->post_parent );
		if ( $post_parent ) {
			$response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
			$response['uploadedToLink']  = get_edit_post_link( $attachment->post_parent, 'raw' );
		}
	}

	$attached_file = get_attached_file( $attachment->ID );

	if ( isset( $meta['filesize'] ) ) {
		$bytes = $meta['filesize'];
	} elseif ( file_exists( $attached_file ) ) {
		$bytes = wp_filesize( $attached_file );
	} else {
		$bytes = '';
	}

	if ( $bytes ) {
		$response['filesizeInBytes']       = $bytes;
		$response['filesizeHumanReadable'] = size_format( $bytes );
	}

	$context             = get_post_meta( $attachment->ID, '_wp_attachment_context', true );
	$response['context'] = ( $context ) ? $context : '';

	if ( current_user_can( 'edit_post', $attachment->ID ) ) {
		$response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
		$response['nonces']['edit']   = wp_create_nonce( 'image_editor-' . $attachment->ID );
		$response['editLink']         = get_edit_post_link( $attachment->ID, 'raw' );
	}

	if ( current_user_can( 'delete_post', $attachment->ID ) ) {
		$response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );
	}

	if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) {
		$sizes = array();

		/** This filter is documented in wp-admin/includes/media.php */
		$possible_sizes = apply_filters(
			'image_size_names_choose',
			array(
				'thumbnail' => __( 'Thumbnail' ),
				'medium'    => __( 'Medium' ),
				'large'     => __( 'Large' ),
				'full'      => __( 'Full Size' ),
			)
		);
		unset( $possible_sizes['full'] );

		/*
		 * Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
		 * First: run the image_downsize filter. If it returns something, we can use its data.
		 * If the filter does not return something, then image_downsize() is just an expensive way
		 * to check the image metadata, which we do second.
		 */
		foreach ( $possible_sizes as $size => $label ) {

			/** This filter is documented in wp-includes/media.php */
			$downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size );

			if ( $downsize ) {
				if ( empty( $downsize[3] ) ) {
					continue;
				}

				$sizes[ $size ] = array(
					'height'      => $downsize[2],
					'width'       => $downsize[1],
					'url'         => $downsize[0],
					'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
				);
			} elseif ( isset( $meta['sizes'][ $size ] ) ) {
				// Nothing from the filter, so consult image metadata if we have it.
				$size_meta = $meta['sizes'][ $size ];

				/*
				 * We have the actual image size, but might need to further constrain it if content_width is narrower.
				 * Thumbnail, medium, and full sizes are also checked against the site's height/width options.
				 */
				list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );

				$sizes[ $size ] = array(
					'height'      => $height,
					'width'       => $width,
					'url'         => $base_url . $size_meta['file'],
					'orientation' => $height > $width ? 'portrait' : 'landscape',
				);
			}
		}

		if ( 'image' === $type ) {
			if ( ! empty( $meta['original_image'] ) ) {
				$response['originalImageURL']  = wp_get_original_image_url( $attachment->ID );
				$response['originalImageName'] = wp_basename( wp_get_original_image_path( $attachment->ID ) );
			}

			$sizes['full'] = array( 'url' => $attachment_url );

			if ( isset( $meta['height'], $meta['width'] ) ) {
				$sizes['full']['height']      = $meta['height'];
				$sizes['full']['width']       = $meta['width'];
				$sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
			}

			$response = array_merge( $response, $sizes['full'] );
		} elseif ( $meta['sizes']['full']['file'] ) {
			$sizes['full'] = array(
				'url'         => $base_url . $meta['sizes']['full']['file'],
				'height'      => $meta['sizes']['full']['height'],
				'width'       => $meta['sizes']['full']['width'],
				'orientation' => $meta['sizes']['full']['height'] > $meta['sizes']['full']['width'] ? 'portrait' : 'landscape',
			);
		}

		$response = array_merge( $response, array( 'sizes' => $sizes ) );
	}

	if ( $meta && 'video' === $type ) {
		if ( isset( $meta['width'] ) ) {
			$response['width'] = (int) $meta['width'];
		}
		if ( isset( $meta['height'] ) ) {
			$response['height'] = (int) $meta['height'];
		}
	}

	if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
		if ( isset( $meta['length_formatted'] ) ) {
			$response['fileLength']              = $meta['length_formatted'];
			$response['fileLengthHumanReadable'] = human_readable_duration( $meta['length_formatted'] );
		}

		$response['meta'] = array();
		foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
			$response['meta'][ $key ] = false;

			if ( ! empty( $meta[ $key ] ) ) {
				$response['meta'][ $key ] = $meta[ $key ];
			}
		}

		$id = get_post_thumbnail_id( $attachment->ID );
		if ( ! empty( $id ) ) {
			list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
			$response['image']            = compact( 'src', 'width', 'height' );
			list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
			$response['thumb']            = compact( 'src', 'width', 'height' );
		} else {
			$src               = wp_mime_type_icon( $attachment->ID, '.svg' );
			$width             = 48;
			$height            = 64;
			$response['image'] = compact( 'src', 'width', 'height' );
			$response['thumb'] = compact( 'src', 'width', 'height' );
		}
	}

	if ( function_exists( 'get_compat_media_markup' ) ) {
		$response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );
	}

	if ( function_exists( 'get_media_states' ) ) {
		$media_states = get_media_states( $attachment );
		if ( ! empty( $media_states ) ) {
			$response['mediaStates'] = implode( ', ', $media_states );
		}
	}

	/**
	 * Filters the attachment data prepared for JavaScript.
	 *
	 * @since 3.5.0
	 *
	 * @param array       $response   Array of prepared attachment data. See {@see wp_prepare_attachment_for_js()}.
	 * @param WP_Post     $attachment Attachment object.
	 * @param array|false $meta       Array of attachment meta data, or false if there is none.
	 */
	return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
}

/**
 * Enqueues all scripts, styles, settings, and templates necessary to use
 * all media JS APIs.
 *
 * @since 3.5.0
 *
 * @global int       $content_width
 * @global wpdb      $wpdb          WordPress database abstraction object.
 * @global WP_Locale $wp_locale     WordPress date and time locale object.
 *
 * @param array $args {
 *     Arguments for enqueuing media scripts.
 *
 *     @type int|WP_Post $post Post ID or post object.
 * }
 */
function wp_enqueue_media( $args = array() ) {
	// Enqueue me just once per page, please.
	if ( did_action( 'wp_enqueue_media' ) ) {
		return;
	}

	global $content_width, $wpdb, $wp_locale;

	$defaults = array(
		'post' => null,
	);
	$args     = wp_parse_args( $args, $defaults );

	/*
	 * We're going to pass the old thickbox media tabs to `media_upload_tabs`
	 * to ensure plugins will work. We will then unset those tabs.
	 */
	$tabs = array(
		// handler action suffix => tab label
		'type'     => '',
		'type_url' => '',
		'gallery'  => '',
		'library'  => '',
	);

	/** This filter is documented in wp-admin/includes/media.php */
	$tabs = apply_filters( 'media_upload_tabs', $tabs );
	unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );

	$props = array(
		'link'  => get_option( 'image_default_link_type' ), // DB default is 'file'.
		'align' => get_option( 'image_default_align' ),     // Empty default.
		'size'  => get_option( 'image_default_size' ),      // Empty default.
	);

	$exts      = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
	$mimes     = get_allowed_mime_types();
	$ext_mimes = array();
	foreach ( $exts as $ext ) {
		foreach ( $mimes as $ext_preg => $mime_match ) {
			if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
				$ext_mimes[ $ext ] = $mime_match;
				break;
			}
		}
	}

	/**
	 * Allows showing or hiding the "Create Audio Playlist" button in the media library.
	 *
	 * By default, the "Create Audio Playlist" button will always be shown in
	 * the media library.  If this filter returns `null`, a query will be run
	 * to determine whether the media library contains any audio items.  This
	 * was the default behavior prior to version 4.8.0, but this query is
	 * expensive for large media libraries.
	 *
	 * @since 4.7.4
	 * @since 4.8.0 The filter's default value is `true` rather than `null`.
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param bool|null $show Whether to show the button, or `null` to decide based
	 *                        on whether any audio files exist in the media library.
	 */
	$show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
	if ( null === $show_audio_playlist ) {
		$show_audio_playlist = $wpdb->get_var(
			"SELECT ID
			FROM $wpdb->posts
			WHERE post_type = 'attachment'
			AND post_mime_type LIKE 'audio%'
			LIMIT 1"
		);
	}

	/**
	 * Allows showing or hiding the "Create Video Playlist" button in the media library.
	 *
	 * By default, the "Create Video Playlist" button will always be shown in
	 * the media library.  If this filter returns `null`, a query will be run
	 * to determine whether the media library contains any video items.  This
	 * was the default behavior prior to version 4.8.0, but this query is
	 * expensive for large media libraries.
	 *
	 * @since 4.7.4
	 * @since 4.8.0 The filter's default value is `true` rather than `null`.
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param bool|null $show Whether to show the button, or `null` to decide based
	 *                        on whether any video files exist in the media library.
	 */
	$show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
	if ( null === $show_video_playlist ) {
		$show_video_playlist = $wpdb->get_var(
			"SELECT ID
			FROM $wpdb->posts
			WHERE post_type = 'attachment'
			AND post_mime_type LIKE 'video%'
			LIMIT 1"
		);
	}

	/**
	 * Allows overriding the list of months displayed in the media library.
	 *
	 * By default (if this filter does not return an array), a query will be
	 * run to determine the months that have media items.  This query can be
	 * expensive for large media libraries, so it may be desirable for sites to
	 * override this behavior.
	 *
	 * @since 4.7.4
	 *
	 * @link https://core.trac.wordpress.org/ticket/31071
	 *
	 * @param stdClass[]|null $months An array of objects with `month` and `year`
	 *                                properties, or `null` for default behavior.
	 */
	$months = apply_filters( 'media_library_months_with_files', null );
	if ( ! is_array( $months ) ) {
		$months = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
				FROM $wpdb->posts
				WHERE post_type = %s
				ORDER BY post_date DESC",
				'attachment'
			)
		);
	}
	foreach ( $months as $month_year ) {
		$month_year->text = sprintf(
			/* translators: 1: Month, 2: Year. */
			__( '%1$s %2$d' ),
			$wp_locale->get_month( $month_year->month ),
			$month_year->year
		);
	}

	/**
	 * Filters whether the Media Library grid has infinite scrolling. Default `false`.
	 *
	 * @since 5.8.0
	 *
	 * @param bool $infinite Whether the Media Library grid has infinite scrolling.
	 */
	$infinite_scrolling = apply_filters( 'media_library_infinite_scrolling', false );

	$settings = array(
		'tabs'              => $tabs,
		'tabUrl'            => add_query_arg( array( 'chromeless' => true ), admin_url( 'media-upload.php' ) ),
		'mimeTypes'         => wp_list_pluck( get_post_mime_types(), 0 ),
		/** This filter is documented in wp-admin/includes/media.php */
		'captions'          => ! apply_filters( 'disable_captions', '' ),
		'nonce'             => array(
			'sendToEditor'           => wp_create_nonce( 'media-send-to-editor' ),
			'setAttachmentThumbnail' => wp_create_nonce( 'set-attachment-thumbnail' ),
		),
		'post'              => array(
			'id' => 0,
		),
		'defaultProps'      => $props,
		'attachmentCounts'  => array(
			'audio' => ( $show_audio_playlist ) ? 1 : 0,
			'video' => ( $show_video_playlist ) ? 1 : 0,
		),
		'oEmbedProxyUrl'    => rest_url( 'oembed/1.0/proxy' ),
		'embedExts'         => $exts,
		'embedMimes'        => $ext_mimes,
		'contentWidth'      => $content_width,
		'months'            => $months,
		'mediaTrash'        => MEDIA_TRASH ? 1 : 0,
		'infiniteScrolling' => ( $infinite_scrolling ) ? 1 : 0,
	);

	$post = null;
	if ( isset( $args['post'] ) ) {
		$post             = get_post( $args['post'] );
		$settings['post'] = array(
			'id'    => $post->ID,
			'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
		);

		$thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
		if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
			if ( wp_attachment_is( 'audio', $post ) ) {
				$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
			} elseif ( wp_attachment_is( 'video', $post ) ) {
				$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
			}
		}

		if ( $thumbnail_support ) {
			$featured_image_id                   = get_post_meta( $post->ID, '_thumbnail_id', true );
			$settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
		}
	}

	if ( $post ) {
		$post_type_object = get_post_type_object( $post->post_type );
	} else {
		$post_type_object = get_post_type_object( 'post' );
	}

	$strings = array(
		// Generic.
		'mediaFrameDefaultTitle'      => __( 'Media' ),
		'url'                         => __( 'URL' ),
		'addMedia'                    => __( 'Add media' ),
		'search'                      => __( 'Search' ),
		'select'                      => __( 'Select' ),
		'cancel'                      => __( 'Cancel' ),
		'update'                      => __( 'Update' ),
		'replace'                     => __( 'Replace' ),
		'remove'                      => __( 'Remove' ),
		'back'                        => __( 'Back' ),
		/*
		 * translators: This is a would-be plural string used in the media manager.
		 * If there is not a word you can use in your language to avoid issues with the
		 * lack of plural support here, turn it into "selected: %d" then translate it.
		 */
		'selected'                    => __( '%d selected' ),
		'dragInfo'                    => __( 'Drag and drop to reorder media files.' ),

		// Upload.
		'uploadFilesTitle'            => __( 'Upload files' ),
		'uploadImagesTitle'           => __( 'Upload images' ),

		// Library.
		'mediaLibraryTitle'           => __( 'Media Library' ),
		'insertMediaTitle'            => __( 'Add media' ),
		'createNewGallery'            => __( 'Create a new gallery' ),
		'createNewPlaylist'           => __( 'Create a new playlist' ),
		'createNewVideoPlaylist'      => __( 'Create a new video playlist' ),
		'returnToLibrary'             => __( '&#8592; Go to library' ),
		'allMediaItems'               => __( 'All media items' ),
		'allDates'                    => __( 'All dates' ),
		'noItemsFound'                => __( 'No items found.' ),
		'insertIntoPost'              => $post_type_object->labels->insert_into_item,
		'unattached'                  => _x( 'Unattached', 'media items' ),
		'mine'                        => _x( 'Mine', 'media items' ),
		'trash'                       => _x( 'Trash', 'noun' ),
		'uploadedToThisPost'          => $post_type_object->labels->uploaded_to_this_item,
		'warnDelete'                  => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
		'warnBulkDelete'              => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
		'warnBulkTrash'               => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
		'bulkSelect'                  => __( 'Bulk select' ),
		'trashSelected'               => __( 'Move to Trash' ),
		'restoreSelected'             => __( 'Restore from Trash' ),
		'deletePermanently'           => __( 'Delete permanently' ),
		'errorDeleting'               => __( 'Error in deleting the attachment.' ),
		'apply'                       => __( 'Apply' ),
		'filterByDate'                => __( 'Filter by date' ),
		'filterByType'                => __( 'Filter by type' ),
		'searchLabel'                 => __( 'Search media' ),
		'searchMediaLabel'            => __( 'Search media' ),          // Backward compatibility pre-5.3.
		'searchMediaPlaceholder'      => __( 'Search media items...' ), // Placeholder (no ellipsis), backward compatibility pre-5.3.
		/* translators: %d: Number of attachments found in a search. */
		'mediaFound'                  => __( 'Number of media items found: %d' ),
		'noMedia'                     => __( 'No media items found.' ),
		'noMediaTryNewSearch'         => __( 'No media items found. Try a different search.' ),

		// Library Details.
		'attachmentDetails'           => __( 'Attachment details' ),

		// From URL.
		'insertFromUrlTitle'          => __( 'Insert from URL' ),

		// Featured Images.
		'setFeaturedImageTitle'       => $post_type_object->labels->featured_image,
		'setFeaturedImage'            => $post_type_object->labels->set_featured_image,

		// Gallery.
		'createGalleryTitle'          => __( 'Create gallery' ),
		'editGalleryTitle'            => __( 'Edit gallery' ),
		'cancelGalleryTitle'          => __( '&#8592; Cancel gallery' ),
		'insertGallery'               => __( 'Insert gallery' ),
		'updateGallery'               => __( 'Update gallery' ),
		'addToGallery'                => __( 'Add to gallery' ),
		'addToGalleryTitle'           => __( 'Add to gallery' ),
		'reverseOrder'                => __( 'Reverse order' ),

		// Edit Image.
		'imageDetailsTitle'           => __( 'Image details' ),
		'imageReplaceTitle'           => __( 'Replace image' ),
		'imageDetailsCancel'          => __( 'Cancel edit' ),
		'editImage'                   => __( 'Edit image' ),

		// Crop Image.
		'chooseImage'                 => __( 'Choose image' ),
		'selectAndCrop'               => __( 'Select and crop' ),
		'skipCropping'                => __( 'Skip cropping' ),
		'cropImage'                   => __( 'Crop image' ),
		'cropYourImage'               => __( 'Crop your image' ),
		'cropping'                    => __( 'Cropping&hellip;' ),
		/* translators: 1: Suggested width number, 2: Suggested height number. */
		'suggestedDimensions'         => __( 'Suggested image dimensions: %1$s by %2$s pixels.' ),
		'cropError'                   => __( 'There has been an error cropping your image.' ),

		// Edit Audio.
		'audioDetailsTitle'           => __( 'Audio details' ),
		'audioReplaceTitle'           => __( 'Replace audio' ),
		'audioAddSourceTitle'         => __( 'Add audio source' ),
		'audioDetailsCancel'          => __( 'Cancel edit' ),

		// Edit Video.
		'videoDetailsTitle'           => __( 'Video details' ),
		'videoReplaceTitle'           => __( 'Replace video' ),
		'videoAddSourceTitle'         => __( 'Add video source' ),
		'videoDetailsCancel'          => __( 'Cancel edit' ),
		'videoSelectPosterImageTitle' => __( 'Select poster image' ),
		'videoAddTrackTitle'          => __( 'Add subtitles' ),

		// Playlist.
		'playlistDragInfo'            => __( 'Drag and drop to reorder tracks.' ),
		'createPlaylistTitle'         => __( 'Create audio playlist' ),
		'editPlaylistTitle'           => __( 'Edit audio playlist' ),
		'cancelPlaylistTitle'         => __( '&#8592; Cancel audio playlist' ),
		'insertPlaylist'              => __( 'Insert audio playlist' ),
		'updatePlaylist'              => __( 'Update audio playlist' ),
		'addToPlaylist'               => __( 'Add to audio playlist' ),
		'addToPlaylistTitle'          => __( 'Add to Audio Playlist' ),

		// Video Playlist.
		'videoPlaylistDragInfo'       => __( 'Drag and drop to reorder videos.' ),
		'createVideoPlaylistTitle'    => __( 'Create video playlist' ),
		'editVideoPlaylistTitle'      => __( 'Edit video playlist' ),
		'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel video playlist' ),
		'insertVideoPlaylist'         => __( 'Insert video playlist' ),
		'updateVideoPlaylist'         => __( 'Update video playlist' ),
		'addToVideoPlaylist'          => __( 'Add to video playlist' ),
		'addToVideoPlaylistTitle'     => __( 'Add to video Playlist' ),

		// Headings.
		'filterAttachments'           => __( 'Filter media' ),
		'attachmentsList'             => __( 'Media list' ),
	);

	/**
	 * Filters the media view settings.
	 *
	 * @since 3.5.0
	 *
	 * @param array   $settings List of media view settings.
	 * @param WP_Post $post     Post object.
	 */
	$settings = apply_filters( 'media_view_settings', $settings, $post );

	/**
	 * Filters the media view strings.
	 *
	 * @since 3.5.0
	 *
	 * @param string[] $strings Array of media view strings keyed by the name they'll be referenced by in JavaScript.
	 * @param WP_Post  $post    Post object.
	 */
	$strings = apply_filters( 'media_view_strings', $strings, $post );

	$strings['settings'] = $settings;

	/*
	 * Ensure we enqueue media-editor first, that way media-views
	 * is registered internally before we try to localize it. See #24724.
	 */
	wp_enqueue_script( 'media-editor' );
	wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );

	wp_enqueue_script( 'media-audiovideo' );
	wp_enqueue_style( 'media-views' );
	if ( is_admin() ) {
		wp_enqueue_script( 'mce-view' );
		wp_enqueue_script( 'image-edit' );
	}
	wp_enqueue_style( 'imgareaselect' );
	wp_plupload_default_settings();

	require_once ABSPATH . WPINC . '/media-template.php';
	add_action( 'admin_footer', 'wp_print_media_templates' );
	add_action( 'wp_footer', 'wp_print_media_templates' );
	add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );

	/**
	 * Fires at the conclusion of wp_enqueue_media().
	 *
	 * @since 3.5.0
	 */
	do_action( 'wp_enqueue_media' );
}

/**
 * Retrieves media attached to the passed post.
 *
 * @since 3.6.0
 *
 * @param string      $type Mime type.
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @return WP_Post[] Array of media attached to the given post.
 */
function get_attached_media( $type, $post = 0 ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return array();
	}

	$args = array(
		'post_parent'    => $post->ID,
		'post_type'      => 'attachment',
		'post_mime_type' => $type,
		'posts_per_page' => -1,
		'orderby'        => 'menu_order',
		'order'          => 'ASC',
	);

	/**
	 * Filters arguments used to retrieve media attached to the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param array   $args Post query arguments.
	 * @param string  $type Mime type of the desired media.
	 * @param WP_Post $post Post object.
	 */
	$args = apply_filters( 'get_attached_media_args', $args, $type, $post );

	$children = get_children( $args );

	/**
	 * Filters the list of media attached to the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param WP_Post[] $children Array of media attached to the given post.
	 * @param string    $type     Mime type of the media desired.
	 * @param WP_Post   $post     Post object.
	 */
	return (array) apply_filters( 'get_attached_media', $children, $type, $post );
}

/**
 * Checks the HTML content for an audio, video, object, embed, or iframe tags.
 *
 * @since 3.6.0
 *
 * @param string   $content A string of HTML which might contain media elements.
 * @param string[] $types   An array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'.
 * @return string[] Array of found HTML media elements.
 */
function get_media_embedded_in_content( $content, $types = null ) {
	$html = array();

	/**
	 * Filters the embedded media types that are allowed to be returned from the content blob.
	 *
	 * @since 4.2.0
	 *
	 * @param string[] $allowed_media_types An array of allowed media types. Default media types are
	 *                                      'audio', 'video', 'object', 'embed', and 'iframe'.
	 */
	$allowed_media_types = apply_filters( 'media_embedded_in_content_allowed_types', array( 'audio', 'video', 'object', 'embed', 'iframe' ) );

	if ( ! empty( $types ) ) {
		if ( ! is_array( $types ) ) {
			$types = array( $types );
		}

		$allowed_media_types = array_intersect( $allowed_media_types, $types );
	}

	$tags = implode( '|', $allowed_media_types );

	if ( preg_match_all( '#<(?P<tag>' . $tags . ')[^<]*?(?:>[\s\S]*?<\/(?P=tag)>|\s*\/>)#', $content, $matches ) ) {
		foreach ( $matches[0] as $match ) {
			$html[] = $match;
		}
	}

	return $html;
}

/**
 * Retrieves galleries from the passed post's content.
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Post ID or object.
 * @param bool        $html Optional. Whether to return HTML or data in the array. Default true.
 * @return array A list of arrays, each containing gallery data and srcs parsed
 *               from the expanded shortcode.
 */
function get_post_galleries( $post, $html = true ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return array();
	}

	if ( ! has_shortcode( $post->post_content, 'gallery' ) && ! has_block( 'gallery', $post->post_content ) ) {
		return array();
	}

	$galleries = array();
	if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
		foreach ( $matches as $shortcode ) {
			if ( 'gallery' === $shortcode[2] ) {
				$srcs = array();

				$shortcode_attrs = shortcode_parse_atts( $shortcode[3] );

				// Specify the post ID of the gallery we're viewing if the shortcode doesn't reference another post already.
				if ( ! isset( $shortcode_attrs['id'] ) ) {
					$shortcode[3] .= ' id="' . (int) $post->ID . '"';
				}

				$gallery = do_shortcode_tag( $shortcode );
				if ( $html ) {
					$galleries[] = $gallery;
				} else {
					preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
					if ( ! empty( $src ) ) {
						foreach ( $src as $s ) {
							$srcs[] = $s[2];
						}
					}

					$galleries[] = array_merge(
						$shortcode_attrs,
						array(
							'src' => array_values( array_unique( $srcs ) ),
						)
					);
				}
			}
		}
	}

	if ( has_block( 'gallery', $post->post_content ) ) {
		$post_blocks = parse_blocks( $post->post_content );

		while ( $block = array_shift( $post_blocks ) ) {
			$has_inner_blocks = ! empty( $block['innerBlocks'] );

			// Skip blocks with no blockName and no innerHTML.
			if ( ! $block['blockName'] ) {
				continue;
			}

			// Skip non-Gallery blocks.
			if ( 'core/gallery' !== $block['blockName'] ) {
				// Move inner blocks into the root array before skipping.
				if ( $has_inner_blocks ) {
					array_push( $post_blocks, ...$block['innerBlocks'] );
				}
				continue;
			}

			// New Gallery block format as HTML.
			if ( $has_inner_blocks && $html ) {
				$block_html  = wp_list_pluck( $block['innerBlocks'], 'innerHTML' );
				$galleries[] = '<figure>' . implode( ' ', $block_html ) . '</figure>';
				continue;
			}

			$srcs = array();

			// New Gallery block format as an array.
			if ( $has_inner_blocks ) {
				$attrs = wp_list_pluck( $block['innerBlocks'], 'attrs' );
				$ids   = wp_list_pluck( $attrs, 'id' );

				foreach ( $ids as $id ) {
					$url = wp_get_attachment_url( $id );

					if ( is_string( $url ) && ! in_array( $url, $srcs, true ) ) {
						$srcs[] = $url;
					}
				}

				$galleries[] = array(
					'ids' => implode( ',', $ids ),
					'src' => $srcs,
				);

				continue;
			}

			// Old Gallery block format as HTML.
			if ( $html ) {
				$galleries[] = $block['innerHTML'];
				continue;
			}

			// Old Gallery block format as an array.
			$ids = ! empty( $block['attrs']['ids'] ) ? $block['attrs']['ids'] : array();

			// If present, use the image IDs from the JSON blob as canonical.
			if ( ! empty( $ids ) ) {
				foreach ( $ids as $id ) {
					$url = wp_get_attachment_url( $id );

					if ( is_string( $url ) && ! in_array( $url, $srcs, true ) ) {
						$srcs[] = $url;
					}
				}

				$galleries[] = array(
					'ids' => implode( ',', $ids ),
					'src' => $srcs,
				);

				continue;
			}

			// Otherwise, extract srcs from the innerHTML.
			preg_match_all( '#src=([\'"])(.+?)\1#is', $block['innerHTML'], $found_srcs, PREG_SET_ORDER );

			if ( ! empty( $found_srcs[0] ) ) {
				foreach ( $found_srcs as $src ) {
					if ( isset( $src[2] ) && ! in_array( $src[2], $srcs, true ) ) {
						$srcs[] = $src[2];
					}
				}
			}

			$galleries[] = array( 'src' => $srcs );
		}
	}

	/**
	 * Filters the list of all found galleries in the given post.
	 *
	 * @since 3.6.0
	 *
	 * @param array   $galleries Associative array of all found post galleries.
	 * @param WP_Post $post      Post object.
	 */
	return apply_filters( 'get_post_galleries', $galleries, $post );
}

/**
 * Checks a specified post's content for gallery and, if present, return the first
 *
 * @since 3.6.0
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
 * @param bool        $html Optional. Whether to return HTML or data. Default is true.
 * @return string|array Gallery data and srcs parsed from the expanded shortcode.
 */
function get_post_gallery( $post = 0, $html = true ) {
	$galleries = get_post_galleries( $post, $html );
	$gallery   = reset( $galleries );

	/**
	 * Filters the first-found post gallery.
	 *
	 * @since 3.6.0
	 *
	 * @param array       $gallery   The first-found post gallery.
	 * @param int|WP_Post $post      Post ID or object.
	 * @param array       $galleries Associative array of all found post galleries.
	 */
	return apply_filters( 'get_post_gallery', $gallery, $post, $galleries );
}

/**
 * Retrieves the image srcs from galleries from a post's content, if present.
 *
 * @since 3.6.0
 *
 * @see get_post_galleries()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return array A list of lists, each containing image srcs parsed.
 *               from an expanded shortcode
 */
function get_post_galleries_images( $post = 0 ) {
	$galleries = get_post_galleries( $post, false );
	return wp_list_pluck( $galleries, 'src' );
}

/**
 * Checks a post's content for galleries and return the image srcs for the first found gallery.
 *
 * @since 3.6.0
 *
 * @see get_post_gallery()
 *
 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
 * @return string[] A list of a gallery's image srcs in order.
 */
function get_post_gallery_images( $post = 0 ) {
	$gallery = get_post_gallery( $post, false );
	return empty( $gallery['src'] ) ? array() : $gallery['src'];
}

/**
 * Maybe attempts to generate attachment metadata, if missing.
 *
 * @since 3.9.0
 *
 * @param WP_Post $attachment Attachment object.
 */
function wp_maybe_generate_attachment_metadata( $attachment ) {
	if ( empty( $attachment ) || empty( $attachment->ID ) ) {
		return;
	}

	$attachment_id = (int) $attachment->ID;
	$file          = get_attached_file( $attachment_id );
	$meta          = wp_get_attachment_metadata( $attachment_id );

	if ( empty( $meta ) && file_exists( $file ) ) {
		$_meta = get_post_meta( $attachment_id );
		$_lock = 'wp_generating_att_' . $attachment_id;

		if ( ! array_key_exists( '_wp_attachment_metadata', $_meta ) && ! get_transient( $_lock ) ) {
			set_transient( $_lock, $file );
			wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
			delete_transient( $_lock );
		}
	}
}

/**
 * Tries to convert an attachment URL into a post ID.
 *
 * @since 4.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $url The URL to resolve.
 * @return int The found post ID, or 0 on failure.
 */
function attachment_url_to_postid( $url ) {
	global $wpdb;

	$dir  = wp_get_upload_dir();
	$path = $url;

	$site_url   = parse_url( $dir['url'] );
	$image_path = parse_url( $path );

	// Force the protocols to match if needed.
	if ( isset( $image_path['scheme'] ) && ( $image_path['scheme'] !== $site_url['scheme'] ) ) {
		$path = str_replace( $image_path['scheme'], $site_url['scheme'], $path );
	}

	if ( str_starts_with( $path, $dir['baseurl'] . '/' ) ) {
		$path = substr( $path, strlen( $dir['baseurl'] . '/' ) );
	}

	$sql = $wpdb->prepare(
		"SELECT post_id, meta_value FROM $wpdb->postmeta WHERE meta_key = '_wp_attached_file' AND meta_value = %s",
		$path
	);

	$results = $wpdb->get_results( $sql );
	$post_id = null;

	if ( $results ) {
		// Use the first available result, but prefer a case-sensitive match, if exists.
		$post_id = reset( $results )->post_id;

		if ( count( $results ) > 1 ) {
			foreach ( $results as $result ) {
				if ( $path === $result->meta_value ) {
					$post_id = $result->post_id;
					break;
				}
			}
		}
	}

	/**
	 * Filters an attachment ID found by URL.
	 *
	 * @since 4.2.0
	 *
	 * @param int|null $post_id The post_id (if any) found by the function.
	 * @param string   $url     The URL being looked up.
	 */
	return (int) apply_filters( 'attachment_url_to_postid', $post_id, $url );
}

/**
 * Returns the URLs for CSS files used in an iframe-sandbox'd TinyMCE media view.
 *
 * @since 4.0.0
 *
 * @return string[] The relevant CSS file URLs.
 */
function wpview_media_sandbox_styles() {
	$version        = 'ver=' . get_bloginfo( 'version' );
	$mediaelement   = includes_url( "js/mediaelement/mediaelementplayer-legacy.min.css?$version" );
	$wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );

	return array( $mediaelement, $wpmediaelement );
}

/**
 * Registers the personal data exporter for media.
 *
 * @param array[] $exporters An array of personal data exporters, keyed by their ID.
 * @return array[] Updated array of personal data exporters.
 */
function wp_register_media_personal_data_exporter( $exporters ) {
	$exporters['wordpress-media'] = array(
		'exporter_friendly_name' => __( 'WordPress Media' ),
		'callback'               => 'wp_media_personal_data_exporter',
	);

	return $exporters;
}

/**
 * Finds and exports attachments associated with an email address.
 *
 * @since 4.9.6
 *
 * @param string $email_address The attachment owner email address.
 * @param int    $page          Attachment page number.
 * @return array {
 *     An array of personal data.
 *
 *     @type array[] $data An array of personal data arrays.
 *     @type bool    $done Whether the exporter is finished.
 * }
 */
function wp_media_personal_data_exporter( $email_address, $page = 1 ) {
	// Limit us to 50 attachments at a time to avoid timing out.
	$number = 50;
	$page   = (int) $page;

	$data_to_export = array();

	$user = get_user_by( 'email', $email_address );
	if ( false === $user ) {
		return array(
			'data' => $data_to_export,
			'done' => true,
		);
	}

	$post_query = new WP_Query(
		array(
			'author'         => $user->ID,
			'posts_per_page' => $number,
			'paged'          => $page,
			'post_type'      => 'attachment',
			'post_status'    => 'any',
			'orderby'        => 'ID',
			'order'          => 'ASC',
		)
	);

	foreach ( (array) $post_query->posts as $post ) {
		$attachment_url = wp_get_attachment_url( $post->ID );

		if ( $attachment_url ) {
			$post_data_to_export = array(
				array(
					'name'  => __( 'URL' ),
					'value' => $attachment_url,
				),
			);

			$data_to_export[] = array(
				'group_id'          => 'media',
				'group_label'       => __( 'Media' ),
				'group_description' => __( 'User&#8217;s media data.' ),
				'item_id'           => "post-{$post->ID}",
				'data'              => $post_data_to_export,
			);
		}
	}

	$done = $post_query->max_num_pages <= $page;

	return array(
		'data' => $data_to_export,
		'done' => $done,
	);
}

/**
 * Adds additional default image sub-sizes.
 *
 * These sizes are meant to enhance the way WordPress displays images on the front-end on larger,
 * high-density devices. They make it possible to generate more suitable `srcset` and `sizes` attributes
 * when the users upload large images.
 *
 * The sizes can be changed or removed by themes and plugins but that is not recommended.
 * The size "names" reflect the image dimensions, so changing the sizes would be quite misleading.
 *
 * @since 5.3.0
 * @access private
 */
function _wp_add_additional_image_sizes() {
	// 2x medium_large size.
	add_image_size( '1536x1536', 1536, 1536 );
	// 2x large size.
	add_image_size( '2048x2048', 2048, 2048 );
}

/**
 * Callback to enable showing of the user error when uploading .heic images.
 *
 * @since 5.5.0
 *
 * @param array[] $plupload_settings The settings for Plupload.js.
 * @return array[] Modified settings for Plupload.js.
 */
function wp_show_heic_upload_error( $plupload_settings ) {
	$plupload_settings['heic_upload_error'] = true;
	return $plupload_settings;
}

/**
 * Allows PHP's getimagesize() to be debuggable when necessary.
 *
 * @since 5.7.0
 * @since 5.8.0 Added support for WebP images.
 * @since 6.5.0 Added support for AVIF images.
 *
 * @param string $filename   The file path.
 * @param array  $image_info Optional. Extended image information (passed by reference).
 * @return array|false Array of image information or false on failure.
 */
function wp_getimagesize( $filename, ?array &$image_info = null ) {
	// Don't silence errors when in debug mode, unless running unit tests.
	if ( defined( 'WP_DEBUG' ) && WP_DEBUG
		&& ! defined( 'WP_RUN_CORE_TESTS' )
	) {
		if ( 2 === func_num_args() ) {
			$info = getimagesize( $filename, $image_info );
		} else {
			$info = getimagesize( $filename );
		}
	} else {
		/*
		 * Silencing notice and warning is intentional.
		 *
		 * getimagesize() has a tendency to generate errors, such as
		 * "corrupt JPEG data: 7191 extraneous bytes before marker",
		 * even when it's able to provide image size information.
		 *
		 * See https://core.trac.wordpress.org/ticket/42480
		 */
		if ( 2 === func_num_args() ) {
			$info = @getimagesize( $filename, $image_info );
		} else {
			$info = @getimagesize( $filename );
		}
	}

	if (
		! empty( $info ) &&
		// Some PHP versions return 0x0 sizes from `getimagesize` for unrecognized image formats, including AVIFs.
		! ( empty( $info[0] ) && empty( $info[1] ) )
	) {
		return $info;
	}

	/*
	 * For PHP versions that don't support WebP images,
	 * extract the image size info from the file headers.
	 */
	if ( 'image/webp' === wp_get_image_mime( $filename ) ) {
		$webp_info = wp_get_webp_info( $filename );
		$width     = $webp_info['width'];
		$height    = $webp_info['height'];

		// Mimic the native return format.
		if ( $width && $height ) {
			return array(
				$width,
				$height,
				IMAGETYPE_WEBP,
				sprintf(
					'width="%d" height="%d"',
					$width,
					$height
				),
				'mime' => 'image/webp',
			);
		}
	}

	// For PHP versions that don't support AVIF images, extract the image size info from the file headers.
	if ( 'image/avif' === wp_get_image_mime( $filename ) ) {
		$avif_info = wp_get_avif_info( $filename );

		$width  = $avif_info['width'];
		$height = $avif_info['height'];

		// Mimic the native return format.
		if ( $width && $height ) {
			return array(
				$width,
				$height,
				IMAGETYPE_AVIF,
				sprintf(
					'width="%d" height="%d"',
					$width,
					$height
				),
				'mime' => 'image/avif',
			);
		}
	}

	// The image could not be parsed.
	return false;
}

/**
 * Extracts meta information about an AVIF file: width, height, bit depth, and number of channels.
 *
 * @since 6.5.0
 *
 * @param string $filename Path to an AVIF file.
 * @return array {
 *     An array of AVIF image information.
 *
 *     @type int|false $width        Image width on success, false on failure.
 *     @type int|false $height       Image height on success, false on failure.
 *     @type int|false $bit_depth    Image bit depth on success, false on failure.
 *     @type int|false $num_channels Image number of channels on success, false on failure.
 * }
 */
function wp_get_avif_info( $filename ) {
	$results = array(
		'width'        => false,
		'height'       => false,
		'bit_depth'    => false,
		'num_channels' => false,
	);

	if ( 'image/avif' !== wp_get_image_mime( $filename ) ) {
		return $results;
	}

	// Parse the file using libavifinfo's PHP implementation.
	require_once ABSPATH . WPINC . '/class-avif-info.php';

	$handle = fopen( $filename, 'rb' );
	if ( $handle ) {
		$parser  = new Avifinfo\Parser( $handle );
		$success = $parser->parse_ftyp() && $parser->parse_file();
		fclose( $handle );
		if ( $success ) {
			$results = $parser->features->primary_item_features;
		}
	}
	return $results;
}

/**
 * Extracts meta information about a WebP file: width, height, and type.
 *
 * @since 5.8.0
 *
 * @param string $filename Path to a WebP file.
 * @return array {
 *     An array of WebP image information.
 *
 *     @type int|false    $width  Image width on success, false on failure.
 *     @type int|false    $height Image height on success, false on failure.
 *     @type string|false $type   The WebP type: one of 'lossy', 'lossless' or 'animated-alpha'.
 *                                False on failure.
 * }
 */
function wp_get_webp_info( $filename ) {
	$width  = false;
	$height = false;
	$type   = false;

	if ( 'image/webp' !== wp_get_image_mime( $filename ) ) {
		return compact( 'width', 'height', 'type' );
	}

	$magic = file_get_contents( $filename, false, null, 0, 40 );

	if ( false === $magic ) {
		return compact( 'width', 'height', 'type' );
	}

	// Make sure we got enough bytes.
	if ( strlen( $magic ) < 40 ) {
		return compact( 'width', 'height', 'type' );
	}

	/*
	 * The headers are a little different for each of the three formats.
	 * Header values based on WebP docs, see https://developers.google.com/speed/webp/docs/riff_container.
	 */
	switch ( substr( $magic, 12, 4 ) ) {
		// Lossy WebP.
		case 'VP8 ':
			$parts  = unpack( 'v2', substr( $magic, 26, 4 ) );
			$width  = (int) ( $parts[1] & 0x3FFF );
			$height = (int) ( $parts[2] & 0x3FFF );
			$type   = 'lossy';
			break;
		// Lossless WebP.
		case 'VP8L':
			$parts  = unpack( 'C4', substr( $magic, 21, 4 ) );
			$width  = (int) ( $parts[1] | ( ( $parts[2] & 0x3F ) << 8 ) ) + 1;
			$height = (int) ( ( ( $parts[2] & 0xC0 ) >> 6 ) | ( $parts[3] << 2 ) | ( ( $parts[4] & 0x03 ) << 10 ) ) + 1;
			$type   = 'lossless';
			break;
		// Animated/alpha WebP.
		case 'VP8X':
			// Pad 24-bit int.
			$width = unpack( 'V', substr( $magic, 24, 3 ) . "\x00" );
			$width = (int) ( $width[1] & 0xFFFFFF ) + 1;
			// Pad 24-bit int.
			$height = unpack( 'V', substr( $magic, 27, 3 ) . "\x00" );
			$height = (int) ( $height[1] & 0xFFFFFF ) + 1;
			$type   = 'animated-alpha';
			break;
	}

	return compact( 'width', 'height', 'type' );
}

/**
 * Gets loading optimization attributes.
 *
 * This function returns an array of attributes that should be merged into the given attributes array to optimize
 * loading performance. Potential attributes returned by this function are:
 * - `loading` attribute with a value of "lazy"
 * - `fetchpriority` attribute with a value of "high"
 * - `decoding` attribute with a value of "async"
 *
 * If any of these attributes are already present in the given attributes, they will not be modified. Note that no
 * element should have both `loading="lazy"` and `fetchpriority="high"`, so the function will trigger a warning in case
 * both attributes are present with those values.
 *
 * @since 6.3.0
 *
 * @global WP_Query $wp_query WordPress Query object.
 *
 * @param string $tag_name The tag name.
 * @param array  $attr     Array of the attributes for the tag.
 * @param string $context  Context for the element for which the loading optimization attribute is requested.
 * @return array Loading optimization attributes.
 */
function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
	global $wp_query;

	/**
	 * Filters whether to short-circuit loading optimization attributes.
	 *
	 * Returning an array from the filter will effectively short-circuit the loading of optimization attributes,
	 * returning that value instead.
	 *
	 * @since 6.4.0
	 *
	 * @param array|false $loading_attrs False by default, or array of loading optimization attributes to short-circuit.
	 * @param string      $tag_name      The tag name.
	 * @param array       $attr          Array of the attributes for the tag.
	 * @param string      $context       Context for the element for which the loading optimization attribute is requested.
	 */
	$loading_attrs = apply_filters( 'pre_wp_get_loading_optimization_attributes', false, $tag_name, $attr, $context );

	if ( is_array( $loading_attrs ) ) {
		return $loading_attrs;
	}

	$loading_attrs = array();

	/*
	 * Skip lazy-loading for the overall block template, as it is handled more granularly.
	 * The skip is also applicable for `fetchpriority`.
	 */
	if ( 'template' === $context ) {
		/** This filter is documented in wp-includes/media.php */
		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
	}

	// For now this function only supports images and iframes.
	if ( 'img' !== $tag_name && 'iframe' !== $tag_name ) {
		/** This filter is documented in wp-includes/media.php */
		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
	}

	/*
	 * Skip programmatically created images within content blobs as they need to be handled together with the other
	 * images within the post content or widget content.
	 * Without this clause, they would already be considered within their own context which skews the image count and
	 * can result in the first post content image being lazy-loaded or an image further down the page being marked as a
	 * high priority.
	 */
	if (
		'the_content' !== $context && doing_filter( 'the_content' ) ||
		'widget_text_content' !== $context && doing_filter( 'widget_text_content' ) ||
		'widget_block_content' !== $context && doing_filter( 'widget_block_content' )
	) {
		/** This filter is documented in wp-includes/media.php */
		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );

	}

	/*
	 * Add `decoding` with a value of "async" for every image unless it has a
	 * conflicting `decoding` attribute already present.
	 */
	if ( 'img' === $tag_name ) {
		if ( isset( $attr['decoding'] ) ) {
			$loading_attrs['decoding'] = $attr['decoding'];
		} else {
			$loading_attrs['decoding'] = 'async';
		}
	}

	// For any resources, width and height must be provided, to avoid layout shifts.
	if ( ! isset( $attr['width'], $attr['height'] ) ) {
		/** This filter is documented in wp-includes/media.php */
		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
	}

	/*
	 * The key function logic starts here.
	 */
	$maybe_in_viewport    = null;
	$increase_count       = false;
	$maybe_increase_count = false;

	// Logic to handle a `loading` attribute that is already provided.
	if ( isset( $attr['loading'] ) ) {
		/*
		 * Interpret "lazy" as not in viewport. Any other value can be
		 * interpreted as in viewport (realistically only "eager" or `false`
		 * to force-omit the attribute are other potential values).
		 */
		if ( 'lazy' === $attr['loading'] ) {
			$maybe_in_viewport = false;
		} else {
			$maybe_in_viewport = true;
		}
	}

	// Logic to handle a `fetchpriority` attribute that is already provided.
	if ( isset( $attr['fetchpriority'] ) && 'high' === $attr['fetchpriority'] ) {
		/*
		 * If the image was already determined to not be in the viewport (e.g.
		 * from an already provided `loading` attribute), trigger a warning.
		 * Otherwise, the value can be interpreted as in viewport, since only
		 * the most important in-viewport image should have `fetchpriority` set
		 * to "high".
		 */
		if ( false === $maybe_in_viewport ) {
			_doing_it_wrong(
				__FUNCTION__,
				__( 'An image should not be lazy-loaded and marked as high priority at the same time.' ),
				'6.3.0'
			);
			/*
			 * Set `fetchpriority` here for backward-compatibility as we should
			 * not override what a developer decided, even though it seems
			 * incorrect.
			 */
			$loading_attrs['fetchpriority'] = 'high';
		} else {
			$maybe_in_viewport = true;
		}
	}

	if ( null === $maybe_in_viewport ) {
		$header_enforced_contexts = array(
			'template_part_' . WP_TEMPLATE_PART_AREA_HEADER => true,
			'get_header_image_tag' => true,
		);

		/**
		 * Filters the header-specific contexts.
		 *
		 * @since 6.4.0
		 *
		 * @param array $default_header_enforced_contexts Map of contexts for which elements should be considered
		 *                                                in the header of the page, as $context => $enabled
		 *                                                pairs. The $enabled should always be true.
		 */
		$header_enforced_contexts = apply_filters( 'wp_loading_optimization_force_header_contexts', $header_enforced_contexts );

		// Consider elements with these header-specific contexts to be in viewport.
		if ( isset( $header_enforced_contexts[ $context ] ) ) {
			$maybe_in_viewport    = true;
			$maybe_increase_count = true;
		} elseif ( ! is_admin() && in_the_loop() && is_main_query() ) {
			/*
			 * Get the content media count, since this is a main query
			 * content element. This is accomplished by "increasing"
			 * the count by zero, as the only way to get the count is
			 * to call this function.
			 * The actual count increase happens further below, based
			 * on the `$increase_count` flag set here.
			 */
			$content_media_count = wp_increase_content_media_count( 0 );
			$increase_count      = true;

			// If the count so far is below the threshold, `loading` attribute is omitted.
			if ( $content_media_count < wp_omit_loading_attr_threshold() ) {
				$maybe_in_viewport = true;
			} else {
				$maybe_in_viewport = false;
			}
		} elseif (
			// Only apply for main query but before the loop.
			$wp_query->before_loop && $wp_query->is_main_query()
			/*
			 * Any image before the loop, but after the header has started should not be lazy-loaded,
			 * except when the footer has already started which can happen when the current template
			 * does not include any loop.
			 */
			&& did_action( 'get_header' ) && ! did_action( 'get_footer' )
			) {
			$maybe_in_viewport    = true;
			$maybe_increase_count = true;
		}
	}

	/*
	 * If the element is in the viewport (`true`), potentially add
	 * `fetchpriority` with a value of "high". Otherwise, i.e. if the element
	 * is not not in the viewport (`false`) or it is unknown (`null`), add
	 * `loading` with a value of "lazy".
	 */
	if ( $maybe_in_viewport ) {
		$loading_attrs = wp_maybe_add_fetchpriority_high_attr( $loading_attrs, $tag_name, $attr );
	} else {
		// Only add `loading="lazy"` if the feature is enabled.
		if ( wp_lazy_loading_enabled( $tag_name, $context ) ) {
			$loading_attrs['loading'] = 'lazy';
		}
	}

	/*
	 * If flag was set based on contextual logic above, increase the content
	 * media count, either unconditionally, or based on whether the image size
	 * is larger than the threshold.
	 */
	if ( $increase_count ) {
		wp_increase_content_media_count();
	} elseif ( $maybe_increase_count ) {
		/** This filter is documented in wp-includes/media.php */
		$wp_min_priority_img_pixels = apply_filters( 'wp_min_priority_img_pixels', 50000 );

		if ( $wp_min_priority_img_pixels <= $attr['width'] * $attr['height'] ) {
			wp_increase_content_media_count();
		}
	}

	/**
	 * Filters the loading optimization attributes.
	 *
	 * @since 6.4.0
	 *
	 * @param array  $loading_attrs The loading optimization attributes.
	 * @param string $tag_name      The tag name.
	 * @param array  $attr          Array of the attributes for the tag.
	 * @param string $context       Context for the element for which the loading optimization attribute is requested.
	 */
	return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
}

/**
 * Gets the threshold for how many of the first content media elements to not lazy-load.
 *
 * This function runs the {@see 'wp_omit_loading_attr_threshold'} filter, which uses a default threshold value of 3.
 * The filter is only run once per page load, unless the `$force` parameter is used.
 *
 * @since 5.9.0
 *
 * @param bool $force Optional. If set to true, the filter will be (re-)applied even if it already has been before.
 *                    Default false.
 * @return int The number of content media elements to not lazy-load.
 */
function wp_omit_loading_attr_threshold( $force = false ) {
	static $omit_threshold;

	// This function may be called multiple times. Run the filter only once per page load.
	if ( ! isset( $omit_threshold ) || $force ) {
		/**
		 * Filters the threshold for how many of the first content media elements to not lazy-load.
		 *
		 * For these first content media elements, the `loading` attribute will be omitted. By default, this is the case
		 * for only the very first content media element.
		 *
		 * @since 5.9.0
		 * @since 6.3.0 The default threshold was changed from 1 to 3.
		 *
		 * @param int $omit_threshold The number of media elements where the `loading` attribute will not be added. Default 3.
		 */
		$omit_threshold = apply_filters( 'wp_omit_loading_attr_threshold', 3 );
	}

	return $omit_threshold;
}

/**
 * Increases an internal content media count variable.
 *
 * @since 5.9.0
 * @access private
 *
 * @param int $amount Optional. Amount to increase by. Default 1.
 * @return int The latest content media count, after the increase.
 */
function wp_increase_content_media_count( $amount = 1 ) {
	static $content_media_count = 0;

	$content_media_count += $amount;

	return $content_media_count;
}

/**
 * Determines whether to add `fetchpriority='high'` to loading attributes.
 *
 * @since 6.3.0
 * @access private
 *
 * @param array  $loading_attrs Array of the loading optimization attributes for the element.
 * @param string $tag_name      The tag name.
 * @param array  $attr          Array of the attributes for the element.
 * @return array Updated loading optimization attributes for the element.
 */
function wp_maybe_add_fetchpriority_high_attr( $loading_attrs, $tag_name, $attr ) {
	// For now, adding `fetchpriority="high"` is only supported for images.
	if ( 'img' !== $tag_name ) {
		return $loading_attrs;
	}

	if ( isset( $attr['fetchpriority'] ) ) {
		/*
		 * While any `fetchpriority` value could be set in `$loading_attrs`,
		 * for consistency we only do it for `fetchpriority="high"` since that
		 * is the only possible value that WordPress core would apply on its
		 * own.
		 */
		if ( 'high' === $attr['fetchpriority'] ) {
			$loading_attrs['fetchpriority'] = 'high';
			wp_high_priority_element_flag( false );
		}

		return $loading_attrs;
	}

	// Lazy-loading and `fetchpriority="high"` are mutually exclusive.
	if ( isset( $loading_attrs['loading'] ) && 'lazy' === $loading_attrs['loading'] ) {
		return $loading_attrs;
	}

	if ( ! wp_high_priority_element_flag() ) {
		return $loading_attrs;
	}

	/**
	 * Filters the minimum square-pixels threshold for an image to be eligible as the high-priority image.
	 *
	 * @since 6.3.0
	 *
	 * @param int $threshold Minimum square-pixels threshold. Default 50000.
	 */
	$wp_min_priority_img_pixels = apply_filters( 'wp_min_priority_img_pixels', 50000 );

	if ( $wp_min_priority_img_pixels <= $attr['width'] * $attr['height'] ) {
		$loading_attrs['fetchpriority'] = 'high';
		wp_high_priority_element_flag( false );
	}

	return $loading_attrs;
}

/**
 * Accesses a flag that indicates if an element is a possible candidate for `fetchpriority='high'`.
 *
 * @since 6.3.0
 * @access private
 *
 * @param bool $value Optional. Used to change the static variable. Default null.
 * @return bool Returns true if high-priority element was marked already, otherwise false.
 */
function wp_high_priority_element_flag( $value = null ) {
	static $high_priority_element = true;

	if ( is_bool( $value ) ) {
		$high_priority_element = $value;
	}

	return $high_priority_element;
}
otherwise.
 *
 * @since 6.5.0
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the script module ID to register when multiple
 *                           items passed. Default 0.
 * @return string|false Script module ID or false on failure.
 */
function register_block_script_module_id( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$module_id = $metadata[ $field_name ];
	if ( is_array( $module_id ) ) {
		if ( empty( $module_id[ $index ] ) ) {
			return false;
		}
		$module_id = $module_id[ $index ];
	}

	$module_path = remove_block_asset_path_prefix( $module_id );
	if ( $module_id === $module_path ) {
		return $module_id;
	}

	$path                  = dirname( $metadata['file'] );
	$module_asset_raw_path = $path . '/' . substr_replace( $module_path, '.asset.php', - strlen( '.js' ) );
	$module_id             = generate_block_asset_handle( $metadata['name'], $field_name, $index );
	$module_asset_path     = wp_normalize_path(
		realpath( $module_asset_raw_path )
	);

	$module_path_norm = wp_normalize_path( realpath( $path . '/' . $module_path ) );
	$module_uri       = get_block_asset_url( $module_path_norm );

	$module_asset        = ! empty( $module_asset_path ) ? require $module_asset_path : array();
	$module_dependencies = isset( $module_asset['dependencies'] ) ? $module_asset['dependencies'] : array();
	$block_version       = isset( $metadata['version'] ) ? $metadata['version'] : false;
	$module_version      = isset( $module_asset['version'] ) ? $module_asset['version'] : $block_version;

	wp_register_script_module(
		$module_id,
		$module_uri,
		$module_dependencies,
		$module_version
	);

	return $module_id;
}

/**
 * Finds a script handle for the selected block metadata field. It detects
 * when a path to file was provided and optionally finds a corresponding asset
 * file with details necessary to register the script under automatically
 * generated handle name. It returns unprocessed script handle otherwise.
 *
 * @since 5.5.0
 * @since 6.1.0 Added `$index` parameter.
 * @since 6.5.0 The asset file is optional. Added script handle support in the asset file.
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the script to register when multiple items passed.
 *                           Default 0.
 * @return string|false Script handle provided directly or created through
 *                      script's registration, or false on failure.
 */
function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$script_handle_or_path = $metadata[ $field_name ];
	if ( is_array( $script_handle_or_path ) ) {
		if ( empty( $script_handle_or_path[ $index ] ) ) {
			return false;
		}
		$script_handle_or_path = $script_handle_or_path[ $index ];
	}

	$script_path = remove_block_asset_path_prefix( $script_handle_or_path );
	if ( $script_handle_or_path === $script_path ) {
		return $script_handle_or_path;
	}

	$path                  = dirname( $metadata['file'] );
	$script_asset_raw_path = $path . '/' . substr_replace( $script_path, '.asset.php', - strlen( '.js' ) );
	$script_asset_path     = wp_normalize_path(
		realpath( $script_asset_raw_path )
	);

	// Asset file for blocks is optional. See https://core.trac.wordpress.org/ticket/60460.
	$script_asset  = ! empty( $script_asset_path ) ? require $script_asset_path : array();
	$script_handle = isset( $script_asset['handle'] ) ?
		$script_asset['handle'] :
		generate_block_asset_handle( $metadata['name'], $field_name, $index );
	if ( wp_script_is( $script_handle, 'registered' ) ) {
		return $script_handle;
	}

	$script_path_norm    = wp_normalize_path( realpath( $path . '/' . $script_path ) );
	$script_uri          = get_block_asset_url( $script_path_norm );
	$script_dependencies = isset( $script_asset['dependencies'] ) ? $script_asset['dependencies'] : array();
	$block_version       = isset( $metadata['version'] ) ? $metadata['version'] : false;
	$script_version      = isset( $script_asset['version'] ) ? $script_asset['version'] : $block_version;
	$script_args         = array();
	if ( 'viewScript' === $field_name && $script_uri ) {
		$script_args['strategy'] = 'defer';
	}

	$result = wp_register_script(
		$script_handle,
		$script_uri,
		$script_dependencies,
		$script_version,
		$script_args
	);
	if ( ! $result ) {
		return false;
	}

	if ( ! empty( $metadata['textdomain'] ) && in_array( 'wp-i18n', $script_dependencies, true ) ) {
		wp_set_script_translations( $script_handle, $metadata['textdomain'] );
	}

	return $script_handle;
}

/**
 * Finds a style handle for the block metadata field. It detects when a path
 * to file was provided and registers the style under automatically
 * generated handle name. It returns unprocessed style handle otherwise.
 *
 * @since 5.5.0
 * @since 6.1.0 Added `$index` parameter.
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the style to register when multiple items passed.
 *                           Default 0.
 * @return string|false Style handle provided directly or created through
 *                      style's registration, or false on failure.
 */
function register_block_style_handle( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$style_handle = $metadata[ $field_name ];
	if ( is_array( $style_handle ) ) {
		if ( empty( $style_handle[ $index ] ) ) {
			return false;
		}
		$style_handle = $style_handle[ $index ];
	}

	$style_handle_name = generate_block_asset_handle( $metadata['name'], $field_name, $index );
	// If the style handle is already registered, skip re-registering.
	if ( wp_style_is( $style_handle_name, 'registered' ) ) {
		return $style_handle_name;
	}

	static $wpinc_path_norm = '';
	if ( ! $wpinc_path_norm ) {
		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
	}

	$is_core_block = isset( $metadata['file'] ) && str_starts_with( $metadata['file'], $wpinc_path_norm );
	// Skip registering individual styles for each core block when a bundled version provided.
	if ( $is_core_block && ! wp_should_load_separate_core_block_assets() ) {
		return false;
	}

	$style_path      = remove_block_asset_path_prefix( $style_handle );
	$is_style_handle = $style_handle === $style_path;
	// Allow only passing style handles for core blocks.
	if ( $is_core_block && ! $is_style_handle ) {
		return false;
	}
	// Return the style handle unless it's the first item for every core block that requires special treatment.
	if ( $is_style_handle && ! ( $is_core_block && 0 === $index ) ) {
		return $style_handle;
	}

	// Check whether styles should have a ".min" suffix or not.
	$suffix = SCRIPT_DEBUG ? '' : '.min';
	if ( $is_core_block ) {
		$style_path = ( 'editorStyle' === $field_name ) ? "editor{$suffix}.css" : "style{$suffix}.css";
	}

	$style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) );
	$style_uri       = get_block_asset_url( $style_path_norm );

	$version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
	$result  = wp_register_style(
		$style_handle_name,
		$style_uri,
		array(),
		$version
	);
	if ( ! $result ) {
		return false;
	}

	if ( $style_uri ) {
		wp_style_add_data( $style_handle_name, 'path', $style_path_norm );

		if ( $is_core_block ) {
			$rtl_file = str_replace( "{$suffix}.css", "-rtl{$suffix}.css", $style_path_norm );
		} else {
			$rtl_file = str_replace( '.css', '-rtl.css', $style_path_norm );
		}

		if ( is_rtl() && file_exists( $rtl_file ) ) {
			wp_style_add_data( $style_handle_name, 'rtl', 'replace' );
			wp_style_add_data( $style_handle_name, 'suffix', $suffix );
			wp_style_add_data( $style_handle_name, 'path', $rtl_file );
		}
	}

	return $style_handle_name;
}

/**
 * Gets i18n schema for block's metadata read from `block.json` file.
 *
 * @since 5.9.0
 *
 * @return object The schema for block's metadata.
 */
function get_block_metadata_i18n_schema() {
	static $i18n_block_schema;

	if ( ! isset( $i18n_block_schema ) ) {
		$i18n_block_schema = wp_json_file_decode( __DIR__ . '/block-i18n.json' );
	}

	return $i18n_block_schema;
}

/**
 * Registers a block type from the metadata stored in the `block.json` file.
 *
 * @since 5.5.0
 * @since 5.7.0 Added support for `textdomain` field and i18n handling for all translatable fields.
 * @since 5.9.0 Added support for `variations` and `viewScript` fields.
 * @since 6.1.0 Added support for `render` field.
 * @since 6.3.0 Added `selectors` field.
 * @since 6.4.0 Added support for `blockHooks` field.
 * @since 6.5.0 Added support for `allowedBlocks`, `viewScriptModule`, and `viewStyle` fields.
 *
 * @param string $file_or_folder Path to the JSON file with metadata definition for
 *                               the block or path to the folder where the `block.json` file is located.
 *                               If providing the path to a JSON file, the filename must end with `block.json`.
 * @param array  $args           Optional. Array of block type arguments. Accepts any public property
 *                               of `WP_Block_Type`. See WP_Block_Type::__construct() for information
 *                               on accepted arguments. Default empty array.
 * @return WP_Block_Type|false The registered block type on success, or false on failure.
 */
function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
	/*
	 * Get an array of metadata from a PHP file.
	 * This improves performance for core blocks as it's only necessary to read a single PHP file
	 * instead of reading a JSON file per-block, and then decoding from JSON to PHP.
	 * Using a static variable ensures that the metadata is only read once per request.
	 */
	static $core_blocks_meta;
	if ( ! $core_blocks_meta ) {
		$core_blocks_meta = require ABSPATH . WPINC . '/blocks/blocks-json.php';
	}

	$metadata_file = ( ! str_ends_with( $file_or_folder, 'block.json' ) ) ?
		trailingslashit( $file_or_folder ) . 'block.json' :
		$file_or_folder;

	$is_core_block = str_starts_with( $file_or_folder, ABSPATH . WPINC );
	// If the block is not a core block, the metadata file must exist.
	$metadata_file_exists = $is_core_block || file_exists( $metadata_file );
	if ( ! $metadata_file_exists && empty( $args['name'] ) ) {
		return false;
	}

	// Try to get metadata from the static cache for core blocks.
	$metadata = array();
	if ( $is_core_block ) {
		$core_block_name = str_replace( ABSPATH . WPINC . '/blocks/', '', $file_or_folder );
		if ( ! empty( $core_blocks_meta[ $core_block_name ] ) ) {
			$metadata = $core_blocks_meta[ $core_block_name ];
		}
	}

	// If metadata is not found in the static cache, read it from the file.
	if ( $metadata_file_exists && empty( $metadata ) ) {
		$metadata = wp_json_file_decode( $metadata_file, array( 'associative' => true ) );
	}

	if ( ! is_array( $metadata ) || ( empty( $metadata['name'] ) && empty( $args['name'] ) ) ) {
		return false;
	}

	$metadata['file'] = $metadata_file_exists ? wp_normalize_path( realpath( $metadata_file ) ) : null;

	/**
	 * Filters the metadata provided for registering a block type.
	 *
	 * @since 5.7.0
	 *
	 * @param array $metadata Metadata for registering a block type.
	 */
	$metadata = apply_filters( 'block_type_metadata', $metadata );

	// Add `style` and `editor_style` for core blocks if missing.
	if ( ! empty( $metadata['name'] ) && str_starts_with( $metadata['name'], 'core/' ) ) {
		$block_name = str_replace( 'core/', '', $metadata['name'] );

		if ( ! isset( $metadata['style'] ) ) {
			$metadata['style'] = "wp-block-$block_name";
		}
		if ( current_theme_supports( 'wp-block-styles' ) && wp_should_load_separate_core_block_assets() ) {
			$metadata['style']   = (array) $metadata['style'];
			$metadata['style'][] = "wp-block-{$block_name}-theme";
		}
		if ( ! isset( $metadata['editorStyle'] ) ) {
			$metadata['editorStyle'] = "wp-block-{$block_name}-editor";
		}
	}

	$settings          = array();
	$property_mappings = array(
		'apiVersion'      => 'api_version',
		'name'            => 'name',
		'title'           => 'title',
		'category'        => 'category',
		'parent'          => 'parent',
		'ancestor'        => 'ancestor',
		'icon'            => 'icon',
		'description'     => 'description',
		'keywords'        => 'keywords',
		'attributes'      => 'attributes',
		'providesContext' => 'provides_context',
		'usesContext'     => 'uses_context',
		'selectors'       => 'selectors',
		'supports'        => 'supports',
		'styles'          => 'styles',
		'variations'      => 'variations',
		'example'         => 'example',
		'allowedBlocks'   => 'allowed_blocks',
	);
	$textdomain        = ! empty( $metadata['textdomain'] ) ? $metadata['textdomain'] : null;
	$i18n_schema       = get_block_metadata_i18n_schema();

	foreach ( $property_mappings as $key => $mapped_key ) {
		if ( isset( $metadata[ $key ] ) ) {
			$settings[ $mapped_key ] = $metadata[ $key ];
			if ( $metadata_file_exists && $textdomain && isset( $i18n_schema->$key ) ) {
				$settings[ $mapped_key ] = translate_settings_using_i18n_schema( $i18n_schema->$key, $settings[ $key ], $textdomain );
			}
		}
	}

	if ( ! empty( $metadata['render'] ) ) {
		$template_path = wp_normalize_path(
			realpath(
				dirname( $metadata['file'] ) . '/' .
				remove_block_asset_path_prefix( $metadata['render'] )
			)
		);
		if ( $template_path ) {
			/**
			 * Renders the block on the server.
			 *
			 * @since 6.1.0
			 *
			 * @param array    $attributes Block attributes.
			 * @param string   $content    Block default content.
			 * @param WP_Block $block      Block instance.
			 *
			 * @return string Returns the block content.
			 */
			$settings['render_callback'] = static function ( $attributes, $content, $block ) use ( $template_path ) {
				ob_start();
				require $template_path;
				return ob_get_clean();
			};
		}
	}

	$settings = array_merge( $settings, $args );

	$script_fields = array(
		'editorScript' => 'editor_script_handles',
		'script'       => 'script_handles',
		'viewScript'   => 'view_script_handles',
	);
	foreach ( $script_fields as $metadata_field_name => $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$scripts           = $metadata[ $metadata_field_name ];
			$processed_scripts = array();
			if ( is_array( $scripts ) ) {
				for ( $index = 0; $index < count( $scripts ); $index++ ) {
					$result = register_block_script_handle(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_scripts[] = $result;
					}
				}
			} else {
				$result = register_block_script_handle(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_scripts[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_scripts;
		}
	}

	$module_fields = array(
		'viewScriptModule' => 'view_script_module_ids',
	);
	foreach ( $module_fields as $metadata_field_name => $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$modules           = $metadata[ $metadata_field_name ];
			$processed_modules = array();
			if ( is_array( $modules ) ) {
				for ( $index = 0; $index < count( $modules ); $index++ ) {
					$result = register_block_script_module_id(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_modules[] = $result;
					}
				}
			} else {
				$result = register_block_script_module_id(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_modules[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_modules;
		}
	}

	$style_fields = array(
		'editorStyle' => 'editor_style_handles',
		'style'       => 'style_handles',
		'viewStyle'   => 'view_style_handles',
	);
	foreach ( $style_fields as $metadata_field_name => $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$styles           = $metadata[ $metadata_field_name ];
			$processed_styles = array();
			if ( is_array( $styles ) ) {
				for ( $index = 0; $index < count( $styles ); $index++ ) {
					$result = register_block_style_handle(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_styles[] = $result;
					}
				}
			} else {
				$result = register_block_style_handle(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_styles[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_styles;
		}
	}

	if ( ! empty( $metadata['blockHooks'] ) ) {
		/**
		 * Map camelCased position string (from block.json) to snake_cased block type position.
		 *
		 * @var array
		 */
		$position_mappings = array(
			'before'     => 'before',
			'after'      => 'after',
			'firstChild' => 'first_child',
			'lastChild'  => 'last_child',
		);

		$settings['block_hooks'] = array();
		foreach ( $metadata['blockHooks'] as $anchor_block_name => $position ) {
			// Avoid infinite recursion (hooking to itself).
			if ( $metadata['name'] === $anchor_block_name ) {
				_doing_it_wrong(
					__METHOD__,
					__( 'Cannot hook block to itself.' ),
					'6.4.0'
				);
				continue;
			}

			if ( ! isset( $position_mappings[ $position ] ) ) {
				continue;
			}

			$settings['block_hooks'][ $anchor_block_name ] = $position_mappings[ $position ];
		}
	}

	/**
	 * Filters the settings determined from the block type metadata.
	 *
	 * @since 5.7.0
	 *
	 * @param array $settings Array of determined settings for registering a block type.
	 * @param array $metadata Metadata provided for registering a block type.
	 */
	$settings = apply_filters( 'block_type_metadata_settings', $settings, $metadata );

	$metadata['name'] = ! empty( $settings['name'] ) ? $settings['name'] : $metadata['name'];

	return WP_Block_Type_Registry::get_instance()->register(
		$metadata['name'],
		$settings
	);
}

/**
 * Registers a block type. The recommended way is to register a block type using
 * the metadata stored in the `block.json` file.
 *
 * @since 5.0.0
 * @since 5.8.0 First parameter now accepts a path to the `block.json` file.
 *
 * @param string|WP_Block_Type $block_type Block type name including namespace, or alternatively
 *                                         a path to the JSON file with metadata definition for the block,
 *                                         or a path to the folder where the `block.json` file is located,
 *                                         or a complete WP_Block_Type instance.
 *                                         In case a WP_Block_Type is provided, the $args parameter will be ignored.
 * @param array                $args       Optional. Array of block type arguments. Accepts any public property
 *                                         of `WP_Block_Type`. See WP_Block_Type::__construct() for information
 *                                         on accepted arguments. Default empty array.
 *
 * @return WP_Block_Type|false The registered block type on success, or false on failure.
 */
function register_block_type( $block_type, $args = array() ) {
	if ( is_string( $block_type ) && file_exists( $block_type ) ) {
		return register_block_type_from_metadata( $block_type, $args );
	}

	return WP_Block_Type_Registry::get_instance()->register( $block_type, $args );
}

/**
 * Unregisters a block type.
 *
 * @since 5.0.0
 *
 * @param string|WP_Block_Type $name Block type name including namespace, or alternatively
 *                                   a complete WP_Block_Type instance.
 * @return WP_Block_Type|false The unregistered block type on success, or false on failure.
 */
function unregister_block_type( $name ) {
	return WP_Block_Type_Registry::get_instance()->unregister( $name );
}

/**
 * Determines whether a post or content string has blocks.
 *
 * This test optimizes for performance rather than strict accuracy, detecting
 * the pattern of a block but not validating its structure. For strict accuracy,
 * you should use the block parser on post content.
 *
 * @since 5.0.0
 *
 * @see parse_blocks()
 *
 * @param int|string|WP_Post|null $post Optional. Post content, post ID, or post object.
 *                                      Defaults to global $post.
 * @return bool Whether the post has blocks.
 */
function has_blocks( $post = null ) {
	if ( ! is_string( $post ) ) {
		$wp_post = get_post( $post );

		if ( ! $wp_post instanceof WP_Post ) {
			return false;
		}

		$post = $wp_post->post_content;
	}

	return str_contains( (string) $post, '<!-- wp:' );
}

/**
 * Determines whether a $post or a string contains a specific block type.
 *
 * This test optimizes for performance rather than strict accuracy, detecting
 * whether the block type exists but not validating its structure and not checking
 * synced patterns (formerly called reusable blocks). For strict accuracy,
 * you should use the block parser on post content.
 *
 * @since 5.0.0
 *
 * @see parse_blocks()
 *
 * @param string                  $block_name Full block type to look for.
 * @param int|string|WP_Post|null $post       Optional. Post content, post ID, or post object.
 *                                            Defaults to global $post.
 * @return bool Whether the post content contains the specified block.
 */
function has_block( $block_name, $post = null ) {
	if ( ! has_blocks( $post ) ) {
		return false;
	}

	if ( ! is_string( $post ) ) {
		$wp_post = get_post( $post );
		if ( $wp_post instanceof WP_Post ) {
			$post = $wp_post->post_content;
		}
	}

	/*
	 * Normalize block name to include namespace, if provided as non-namespaced.
	 * This matches behavior for WordPress 5.0.0 - 5.3.0 in matching blocks by
	 * their serialized names.
	 */
	if ( ! str_contains( $block_name, '/' ) ) {
		$block_name = 'core/' . $block_name;
	}

	// Test for existence of block by its fully qualified name.
	$has_block = str_contains( $post, '<!-- wp:' . $block_name . ' ' );

	if ( ! $has_block ) {
		/*
		 * If the given block name would serialize to a different name, test for
		 * existence by the serialized form.
		 */
		$serialized_block_name = strip_core_block_namespace( $block_name );
		if ( $serialized_block_name !== $block_name ) {
			$has_block = str_contains( $post, '<!-- wp:' . $serialized_block_name . ' ' );
		}
	}

	return $has_block;
}

/**
 * Returns an array of the names of all registered dynamic block types.
 *
 * @since 5.0.0
 *
 * @return string[] Array of dynamic block names.
 */
function get_dynamic_block_names() {
	$dynamic_block_names = array();

	$block_types = WP_Block_Type_Registry::get_instance()->get_all_registered();
	foreach ( $block_types as $block_type ) {
		if ( $block_type->is_dynamic() ) {
			$dynamic_block_names[] = $block_type->name;
		}
	}

	return $dynamic_block_names;
}

/**
 * Retrieves block types hooked into the given block, grouped by anchor block type and the relative position.
 *
 * @since 6.4.0
 *
 * @return array[] Array of block types grouped by anchor block type and the relative position.
 */
function get_hooked_blocks() {
	$block_types   = WP_Block_Type_Registry::get_instance()->get_all_registered();
	$hooked_blocks = array();
	foreach ( $block_types as $block_type ) {
		if ( ! ( $block_type instanceof WP_Block_Type ) || ! is_array( $block_type->block_hooks ) ) {
			continue;
		}
		foreach ( $block_type->block_hooks as $anchor_block_type => $relative_position ) {
			if ( ! isset( $hooked_blocks[ $anchor_block_type ] ) ) {
				$hooked_blocks[ $anchor_block_type ] = array();
			}
			if ( ! isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] ) ) {
				$hooked_blocks[ $anchor_block_type ][ $relative_position ] = array();
			}
			$hooked_blocks[ $anchor_block_type ][ $relative_position ][] = $block_type->name;
		}
	}

	return $hooked_blocks;
}

/**
 * Returns the markup for blocks hooked to the given anchor block in a specific relative position.
 *
 * @since 6.5.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of 'before', 'after', 'first_child', or 'last_child'.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string
 */
function insert_hooked_blocks( &$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$anchor_block_type  = $parsed_anchor_block['blockName'];
	$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
		? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
		: array();

	/**
	 * Filters the list of hooked block types for a given anchor block type and relative position.
	 *
	 * @since 6.4.0
	 *
	 * @param string[]                        $hooked_block_types The list of hooked block types.
	 * @param string                          $relative_position  The relative position of the hooked blocks.
	 *                                                            Can be one of 'before', 'after', 'first_child', or 'last_child'.
	 * @param string                          $anchor_block_type  The anchor block type.
	 * @param WP_Block_Template|WP_Post|array $context            The block template, template part, `wp_navigation` post type,
	 *                                                            or pattern that the anchor block belongs to.
	 */
	$hooked_block_types = apply_filters( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );

	$markup = '';
	foreach ( $hooked_block_types as $hooked_block_type ) {
		$parsed_hooked_block = array(
			'blockName'    => $hooked_block_type,
			'attrs'        => array(),
			'innerBlocks'  => array(),
			'innerContent' => array(),
		);

		/**
		 * Filters the parsed block array for a given hooked block.
		 *
		 * @since 6.5.0
		 *
		 * @param array|null                      $parsed_hooked_block The parsed block array for the given hooked block type, or null to suppress the block.
		 * @param string                          $hooked_block_type   The hooked block type name.
		 * @param string                          $relative_position   The relative position of the hooked block.
		 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
		 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, `wp_navigation` post type,
		 *                                                             or pattern that the anchor block belongs to.
		 */
		$parsed_hooked_block = apply_filters( 'hooked_block', $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		/**
		 * Filters the parsed block array for a given hooked block.
		 *
		 * The dynamic portion of the hook name, `$hooked_block_type`, refers to the block type name of the specific hooked block.
		 *
		 * @since 6.5.0
		 *
		 * @param array|null                      $parsed_hooked_block The parsed block array for the given hooked block type, or null to suppress the block.
		 * @param string                          $hooked_block_type   The hooked block type name.
		 * @param string                          $relative_position   The relative position of the hooked block.
		 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
		 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, `wp_navigation` post type,
		 *                                                             or pattern that the anchor block belongs to.
		 */
		$parsed_hooked_block = apply_filters( "hooked_block_{$hooked_block_type}", $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		if ( null === $parsed_hooked_block ) {
			continue;
		}

		// It's possible that the filter returned a block of a different type, so we explicitly
		// look for the original `$hooked_block_type` in the `ignoredHookedBlocks` metadata.
		if (
			! isset( $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'] ) ||
			! in_array( $hooked_block_type, $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'], true )
		) {
			$markup .= serialize_block( $parsed_hooked_block );
		}
	}

	return $markup;
}

/**
 * Adds a list of hooked block types to an anchor block's ignored hooked block types.
 *
 * This function is meant for internal use only.
 *
 * @since 6.5.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of 'before', 'after', 'first_child', or 'last_child'.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string Empty string.
 */
function set_ignored_hooked_blocks_metadata( &$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$anchor_block_type  = $parsed_anchor_block['blockName'];
	$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
		? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
		: array();

	/** This filter is documented in wp-includes/blocks.php */
	$hooked_block_types = apply_filters( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );
	if ( empty( $hooked_block_types ) ) {
		return '';
	}

	foreach ( $hooked_block_types as $index => $hooked_block_type ) {
		$parsed_hooked_block = array(
			'blockName'    => $hooked_block_type,
			'attrs'        => array(),
			'innerBlocks'  => array(),
			'innerContent' => array(),
		);

		/** This filter is documented in wp-includes/blocks.php */
		$parsed_hooked_block = apply_filters( 'hooked_block', $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		/** This filter is documented in wp-includes/blocks.php */
		$parsed_hooked_block = apply_filters( "hooked_block_{$hooked_block_type}", $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		if ( null === $parsed_hooked_block ) {
			unset( $hooked_block_types[ $index ] );
		}
	}

	$previously_ignored_hooked_blocks = isset( $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'] )
		? $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks']
		: array();

	$parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'] = array_unique(
		array_merge(
			$previously_ignored_hooked_blocks,
			$hooked_block_types
		)
	);

	// Markup for the hooked blocks has already been created (in `insert_hooked_blocks`).
	return '';
}

/**
 * Runs the hooked blocks algorithm on the given content.
 *
 * @since 6.6.0
 * @access private
 *
 * @param string                          $content  Serialized content.
 * @param WP_Block_Template|WP_Post|array $context  A block template, template part, `wp_navigation` post object,
 *                                                  or pattern that the blocks belong to.
 * @param callable                        $callback A function that will be called for each block to generate
 *                                                  the markup for a given list of blocks that are hooked to it.
 *                                                  Default: 'insert_hooked_blocks'.
 * @return string The serialized markup.
 */
function apply_block_hooks_to_content( $content, $context, $callback = 'insert_hooked_blocks' ) {
	$hooked_blocks = get_hooked_blocks();
	if ( empty( $hooked_blocks ) && ! has_filter( 'hooked_block_types' ) ) {
		return $content;
	}

	$blocks = parse_blocks( $content );

	$before_block_visitor = make_before_block_visitor( $hooked_blocks, $context, $callback );
	$after_block_visitor  = make_after_block_visitor( $hooked_blocks, $context, $callback );

	return traverse_and_serialize_blocks( $blocks, $before_block_visitor, $after_block_visitor );
}

/**
 * Accepts the serialized markup of a block and its inner blocks, and returns serialized markup of the inner blocks.
 *
 * @since 6.6.0
 * @access private
 *
 * @param string $serialized_block The serialized markup of a block and its inner blocks.
 * @return string The serialized markup of the inner blocks.
 */
function remove_serialized_parent_block( $serialized_block ) {
	$start = strpos( $serialized_block, '-->' ) + strlen( '-->' );
	$end   = strrpos( $serialized_block, '<!--' );
	return substr( $serialized_block, $start, $end - $start );
}

/**
 * Updates the wp_postmeta with the list of ignored hooked blocks where the inner blocks are stored as post content.
 * Currently only supports `wp_navigation` post types.
 *
 * @since 6.6.0
 * @access private
 *
 * @param stdClass $post Post object.
 * @return stdClass The updated post object.
 */
function update_ignored_hooked_blocks_postmeta( $post ) {
	/*
	 * In this scenario the user has likely tried to create a navigation via the REST API.
	 * In which case we won't have a post ID to work with and store meta against.
	 */
	if ( empty( $post->ID ) ) {
		return $post;
	}

	/*
	 * Skip meta generation when consumers intentionally update specific Navigation fields
	 * and omit the content update.
	 */
	if ( ! isset( $post->post_content ) ) {
		return $post;
	}

	/*
	 * Skip meta generation when the post content is not a navigation block.
	 */
	if ( ! isset( $post->post_type ) || 'wp_navigation' !== $post->post_type ) {
		return $post;
	}

	$attributes = array();

	$ignored_hooked_blocks = get_post_meta( $post->ID, '_wp_ignored_hooked_blocks', true );
	if ( ! empty( $ignored_hooked_blocks ) ) {
		$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
		$attributes['metadata'] = array(
			'ignoredHookedBlocks' => $ignored_hooked_blocks,
		);
	}

	$markup = get_comment_delimited_block_content(
		'core/navigation',
		$attributes,
		$post->post_content
	);

	$serialized_block = apply_block_hooks_to_content( $markup, get_post( $post->ID ), 'set_ignored_hooked_blocks_metadata' );
	$root_block       = parse_blocks( $serialized_block )[0];

	$ignored_hooked_blocks = isset( $root_block['attrs']['metadata']['ignoredHookedBlocks'] )
		? $root_block['attrs']['metadata']['ignoredHookedBlocks']
		: array();

	if ( ! empty( $ignored_hooked_blocks ) ) {
		$existing_ignored_hooked_blocks = get_post_meta( $post->ID, '_wp_ignored_hooked_blocks', true );
		if ( ! empty( $existing_ignored_hooked_blocks ) ) {
			$existing_ignored_hooked_blocks = json_decode( $existing_ignored_hooked_blocks, true );
			$ignored_hooked_blocks          = array_unique( array_merge( $ignored_hooked_blocks, $existing_ignored_hooked_blocks ) );
		}
		update_post_meta( $post->ID, '_wp_ignored_hooked_blocks', json_encode( $ignored_hooked_blocks ) );
	}

	$post->post_content = remove_serialized_parent_block( $serialized_block );
	return $post;
}

/**
 * Returns the markup for blocks hooked to the given anchor block in a specific relative position and then
 * adds a list of hooked block types to an anchor block's ignored hooked block types.
 *
 * This function is meant for internal use only.
 *
 * @since 6.6.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of 'before', 'after', 'first_child', or 'last_child'.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string
 */
function insert_hooked_blocks_and_set_ignored_hooked_blocks_metadata( &$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$markup  = insert_hooked_blocks( $parsed_anchor_block, $relative_position, $hooked_blocks, $context );
	$markup .= set_ignored_hooked_blocks_metadata( $parsed_anchor_block, $relative_position, $hooked_blocks, $context );

	return $markup;
}

/**
 * Hooks into the REST API response for the core/navigation block and adds the first and last inner blocks.
 *
 * @since 6.6.0
 *
 * @param WP_REST_Response $response The response object.
 * @param WP_Post          $post     Post object.
 * @return WP_REST_Response The response object.
 */
function insert_hooked_blocks_into_rest_response( $response, $post ) {
	if ( ! isset( $response->data['content']['raw'] ) || ! isset( $response->data['content']['rendered'] ) ) {
		return $response;
	}

	$attributes            = array();
	$ignored_hooked_blocks = get_post_meta( $post->ID, '_wp_ignored_hooked_blocks', true );
	if ( ! empty( $ignored_hooked_blocks ) ) {
		$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
		$attributes['metadata'] = array(
			'ignoredHookedBlocks' => $ignored_hooked_blocks,
		);
	}
	$content = get_comment_delimited_block_content(
		'core/navigation',
		$attributes,
		$response->data['content']['raw']
	);

	$content = apply_block_hooks_to_content( $content, $post );

	// Remove mock Navigation block wrapper.
	$content = remove_serialized_parent_block( $content );

	$response->data['content']['raw'] = $content;

	/** This filter is documented in wp-includes/post-template.php */
	$response->data['content']['rendered'] = apply_filters( 'the_content', $content );

	return $response;
}

/**
 * Returns a function that injects the theme attribute into, and hooked blocks before, a given block.
 *
 * The returned function can be used as `$pre_callback` argument to `traverse_and_serialize_block(s)`,
 * where it will inject the `theme` attribute into all Template Part blocks, and prepend the markup for
 * any blocks hooked `before` the given block and as its parent's `first_child`, respectively.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @since 6.5.0 Added $callback argument.
 * @access private
 *
 * @param array                           $hooked_blocks An array of blocks hooked to another given block.
 * @param WP_Block_Template|WP_Post|array $context       A block template, template part, `wp_navigation` post object,
 *                                                       or pattern that the blocks belong to.
 * @param callable                        $callback      A function that will be called for each block to generate
 *                                                       the markup for a given list of blocks that are hooked to it.
 *                                                       Default: 'insert_hooked_blocks'.
 * @return callable A function that returns the serialized markup for the given block,
 *                  including the markup for any hooked blocks before it.
 */
function make_before_block_visitor( $hooked_blocks, $context, $callback = 'insert_hooked_blocks' ) {
	/**
	 * Injects hooked blocks before the given block, injects the `theme` attribute into Template Part blocks, and returns the serialized markup.
	 *
	 * If the current block is a Template Part block, inject the `theme` attribute.
	 * Furthermore, prepend the markup for any blocks hooked `before` the given block and as its parent's
	 * `first_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the theme attribute into, and hooked blocks before. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $prev         The previous sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks prepended to it.
	 */
	return function ( &$block, &$parent_block = null, $prev = null ) use ( $hooked_blocks, $context, $callback ) {
		_inject_theme_attribute_in_template_part_block( $block );

		$markup = '';

		if ( $parent_block && ! $prev ) {
			// Candidate for first-child insertion.
			$markup .= call_user_func_array(
				$callback,
				array( &$parent_block, 'first_child', $hooked_blocks, $context )
			);
		}

		$markup .= call_user_func_array(
			$callback,
			array( &$block, 'before', $hooked_blocks, $context )
		);

		return $markup;
	};
}

/**
 * Returns a function that injects the hooked blocks after a given block.
 *
 * The returned function can be used as `$post_callback` argument to `traverse_and_serialize_block(s)`,
 * where it will append the markup for any blocks hooked `after` the given block and as its parent's
 * `last_child`, respectively.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @since 6.5.0 Added $callback argument.
 * @access private
 *
 * @param array                           $hooked_blocks An array of blocks hooked to another block.
 * @param WP_Block_Template|WP_Post|array $context       A block template, template part, `wp_navigation` post object,
 *                                                       or pattern that the blocks belong to.
 * @param callable                        $callback      A function that will be called for each block to generate
 *                                                       the markup for a given list of blocks that are hooked to it.
 *                                                       Default: 'insert_hooked_blocks'.
 * @return callable A function that returns the serialized markup for the given block,
 *                  including the markup for any hooked blocks after it.
 */
function make_after_block_visitor( $hooked_blocks, $context, $callback = 'insert_hooked_blocks' ) {
	/**
	 * Injects hooked blocks after the given block, and returns the serialized markup.
	 *
	 * Append the markup for any blocks hooked `after` the given block and as its parent's
	 * `last_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the hooked blocks after. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $next         The next sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks appended to it.
	 */
	return function ( &$block, &$parent_block = null, $next = null ) use ( $hooked_blocks, $context, $callback ) {
		$markup = call_user_func_array(
			$callback,
			array( &$block, 'after', $hooked_blocks, $context )
		);

		if ( $parent_block && ! $next ) {
			// Candidate for last-child insertion.
			$markup .= call_user_func_array(
				$callback,
				array( &$parent_block, 'last_child', $hooked_blocks, $context )
			);
		}

		return $markup;
	};
}

/**
 * Given an array of attributes, returns a string in the serialized attributes
 * format prepared for post content.
 *
 * The serialized result is a JSON-encoded string, with unicode escape sequence
 * substitution for characters which might otherwise interfere with embedding
 * the result in an HTML comment.
 *
 * This function must produce output that remains in sync with the output of
 * the serializeAttributes JavaScript function in the block editor in order
 * to ensure consistent operation between PHP and JavaScript.
 *
 * @since 5.3.1
 *
 * @param array $block_attributes Attributes object.
 * @return string Serialized attributes.
 */
function serialize_block_attributes( $block_attributes ) {
	$encoded_attributes = wp_json_encode( $block_attributes, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
	$encoded_attributes = preg_replace( '/--/', '\\u002d\\u002d', $encoded_attributes );
	$encoded_attributes = preg_replace( '/</', '\\u003c', $encoded_attributes );
	$encoded_attributes = preg_replace( '/>/', '\\u003e', $encoded_attributes );
	$encoded_attributes = preg_replace( '/&/', '\\u0026', $encoded_attributes );
	// Regex: /\\"/
	$encoded_attributes = preg_replace( '/\\\\"/', '\\u0022', $encoded_attributes );

	return $encoded_attributes;
}

/**
 * Returns the block name to use for serialization. This will remove the default
 * "core/" namespace from a block name.
 *
 * @since 5.3.1
 *
 * @param string|null $block_name Optional. Original block name. Null if the block name is unknown,
 *                                e.g. Classic blocks have their name set to null. Default null.
 * @return string Block name to use for serialization.
 */
function strip_core_block_namespace( $block_name = null ) {
	if ( is_string( $block_name ) && str_starts_with( $block_name, 'core/' ) ) {
		return substr( $block_name, 5 );
	}

	return $block_name;
}

/**
 * Returns the content of a block, including comment delimiters.
 *
 * @since 5.3.1
 *
 * @param string|null $block_name       Block name. Null if the block name is unknown,
 *                                      e.g. Classic blocks have their name set to null.
 * @param array       $block_attributes Block attributes.
 * @param string      $block_content    Block save content.
 * @return string Comment-delimited block content.
 */
function get_comment_delimited_block_content( $block_name, $block_attributes, $block_content ) {
	if ( is_null( $block_name ) ) {
		return $block_content;
	}

	$serialized_block_name = strip_core_block_namespace( $block_name );
	$serialized_attributes = empty( $block_attributes ) ? '' : serialize_block_attributes( $block_attributes ) . ' ';

	if ( empty( $block_content ) ) {
		return sprintf( '<!-- wp:%s %s/-->', $serialized_block_name, $serialized_attributes );
	}

	return sprintf(
		'<!-- wp:%s %s-->%s<!-- /wp:%s -->',
		$serialized_block_name,
		$serialized_attributes,
		$block_content,
		$serialized_block_name
	);
}

/**
 * Returns the content of a block, including comment delimiters, serializing all
 * attributes from the given parsed block.
 *
 * This should be used when preparing a block to be saved to post content.
 * Prefer `render_block` when preparing a block for display. Unlike
 * `render_block`, this does not evaluate a block's `render_callback`, and will
 * instead preserve the markup as parsed.
 *
 * @since 5.3.1
 *
 * @param array $block {
 *     A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *     @type string   $blockName    Name of block.
 *     @type array    $attrs        Attributes from block comment delimiters.
 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                  have the same structure as this one.
 *     @type string   $innerHTML    HTML from inside block comment delimiters.
 *     @type array    $innerContent List of string fragments and null markers where
 *                                  inner blocks were found.
 * }
 * @return string String of rendered HTML.
 */
function serialize_block( $block ) {
	$block_content = '';

	$index = 0;
	foreach ( $block['innerContent'] as $chunk ) {
		$block_content .= is_string( $chunk ) ? $chunk : serialize_block( $block['innerBlocks'][ $index++ ] );
	}

	if ( ! is_array( $block['attrs'] ) ) {
		$block['attrs'] = array();
	}

	return get_comment_delimited_block_content(
		$block['blockName'],
		$block['attrs'],
		$block_content
	);
}

/**
 * Returns a joined string of the aggregate serialization of the given
 * parsed blocks.
 *
 * @since 5.3.1
 *
 * @param array[] $blocks {
 *     Array of block structures.
 *
 *     @type array ...$0 {
 *         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *         @type string   $blockName    Name of block.
 *         @type array    $attrs        Attributes from block comment delimiters.
 *         @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                      have the same structure as this one.
 *         @type string   $innerHTML    HTML from inside block comment delimiters.
 *         @type array    $innerContent List of string fragments and null markers where
 *                                      inner blocks were found.
 *     }
 * }
 * @return string String of rendered HTML.
 */
function serialize_blocks( $blocks ) {
	return implode( '', array_map( 'serialize_block', $blocks ) );
}

/**
 * Traverses a parsed block tree and applies callbacks before and after serializing it.
 *
 * Recursively traverses the block and its inner blocks and applies the two callbacks provided as
 * arguments, the first one before serializing the block, and the second one after serializing it.
 * If either callback returns a string value, it will be prepended and appended to the serialized
 * block markup, respectively.
 *
 * The callbacks will receive a reference to the current block as their first argument, so that they
 * can also modify it, and the current block's parent block as second argument. Finally, the
 * `$pre_callback` receives the previous block, whereas the `$post_callback` receives
 * the next block as third argument.
 *
 * Serialized blocks are returned including comment delimiters, and with all attributes serialized.
 *
 * This function should be used when there is a need to modify the saved block, or to inject markup
 * into the return value. Prefer `serialize_block` when preparing a block to be saved to post content.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @access private
 *
 * @see serialize_block()
 *
 * @param array    $block         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 * @param callable $pre_callback  Callback to run on each block in the tree before it is traversed and serialized.
 *                                It is called with the following arguments: &$block, $parent_block, $previous_block.
 *                                Its string return value will be prepended to the serialized block markup.
 * @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
 *                                It is called with the following arguments: &$block, $parent_block, $next_block.
 *                                Its string return value will be appended to the serialized block markup.
 * @return string Serialized block markup.
 */
function traverse_and_serialize_block( $block, $pre_callback = null, $post_callback = null ) {
	$block_content = '';
	$block_index   = 0;

	foreach ( $block['innerContent'] as $chunk ) {
		if ( is_string( $chunk ) ) {
			$block_content .= $chunk;
		} else {
			$inner_block = $block['innerBlocks'][ $block_index ];

			if ( is_callable( $pre_callback ) ) {
				$prev = 0 === $block_index
					? null
					: $block['innerBlocks'][ $block_index - 1 ];

				$block_content .= call_user_func_array(
					$pre_callback,
					array( &$inner_block, &$block, $prev )
				);
			}

			if ( is_callable( $post_callback ) ) {
				$next = count( $block['innerBlocks'] ) - 1 === $block_index
					? null
					: $block['innerBlocks'][ $block_index + 1 ];

				$post_markup = call_user_func_array(
					$post_callback,
					array( &$inner_block, &$block, $next )
				);
			}

			$block_content .= traverse_and_serialize_block( $inner_block, $pre_callback, $post_callback );
			$block_content .= isset( $post_markup ) ? $post_markup : '';

			++$block_index;
		}
	}

	if ( ! is_array( $block['attrs'] ) ) {
		$block['attrs'] = array();
	}

	return get_comment_delimited_block_content(
		$block['blockName'],
		$block['attrs'],
		$block_content
	);
}

/**
 * Replaces patterns in a block tree with their content.
 *
 * @since 6.6.0
 *
 * @param array $blocks An array blocks.
 *
 * @return array An array of blocks with patterns replaced by their content.
 */
function resolve_pattern_blocks( $blocks ) {
	static $inner_content;
	// Keep track of seen references to avoid infinite loops.
	static $seen_refs = array();
	$i                = 0;
	while ( $i < count( $blocks ) ) {
		if ( 'core/pattern' === $blocks[ $i ]['blockName'] ) {
			$attrs = $blocks[ $i ]['attrs'];

			if ( empty( $attrs['slug'] ) ) {
				++$i;
				continue;
			}

			$slug = $attrs['slug'];

			if ( isset( $seen_refs[ $slug ] ) ) {
				// Skip recursive patterns.
				array_splice( $blocks, $i, 1 );
				continue;
			}

			$registry = WP_Block_Patterns_Registry::get_instance();
			$pattern  = $registry->get_registered( $slug );

			// Skip unknown patterns.
			if ( ! $pattern ) {
				++$i;
				continue;
			}

			$blocks_to_insert   = parse_blocks( $pattern['content'] );
			$seen_refs[ $slug ] = true;
			$prev_inner_content = $inner_content;
			$inner_content      = null;
			$blocks_to_insert   = resolve_pattern_blocks( $blocks_to_insert );
			$inner_content      = $prev_inner_content;
			unset( $seen_refs[ $slug ] );
			array_splice( $blocks, $i, 1, $blocks_to_insert );

			// If we have inner content, we need to insert nulls in the
			// inner content array, otherwise serialize_blocks will skip
			// blocks.
			if ( $inner_content ) {
				$null_indices  = array_keys( $inner_content, null, true );
				$content_index = $null_indices[ $i ];
				$nulls         = array_fill( 0, count( $blocks_to_insert ), null );
				array_splice( $inner_content, $content_index, 1, $nulls );
			}

			// Skip inserted blocks.
			$i += count( $blocks_to_insert );
		} else {
			if ( ! empty( $blocks[ $i ]['innerBlocks'] ) ) {
				$prev_inner_content           = $inner_content;
				$inner_content                = $blocks[ $i ]['innerContent'];
				$blocks[ $i ]['innerBlocks']  = resolve_pattern_blocks(
					$blocks[ $i ]['innerBlocks']
				);
				$blocks[ $i ]['innerContent'] = $inner_content;
				$inner_content                = $prev_inner_content;
			}
			++$i;
		}
	}
	return $blocks;
}

/**
 * Given an array of parsed block trees, applies callbacks before and after serializing them and
 * returns their concatenated output.
 *
 * Recursively traverses the blocks and their inner blocks and applies the two callbacks provided as
 * arguments, the first one before serializing a block, and the second one after serializing.
 * If either callback returns a string value, it will be prepended and appended to the serialized
 * block markup, respectively.
 *
 * The callbacks will receive a reference to the current block as their first argument, so that they
 * can also modify it, and the current block's parent block as second argument. Finally, the
 * `$pre_callback` receives the previous block, whereas the `$post_callback` receives
 * the next block as third argument.
 *
 * Serialized blocks are returned including comment delimiters, and with all attributes serialized.
 *
 * This function should be used when there is a need to modify the saved blocks, or to inject markup
 * into the return value. Prefer `serialize_blocks` when preparing blocks to be saved to post content.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @access private
 *
 * @see serialize_blocks()
 *
 * @param array[]  $blocks        An array of parsed blocks. See WP_Block_Parser_Block.
 * @param callable $pre_callback  Callback to run on each block in the tree before it is traversed and serialized.
 *                                It is called with the following arguments: &$block, $parent_block, $previous_block.
 *                                Its string return value will be prepended to the serialized block markup.
 * @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
 *                                It is called with the following arguments: &$block, $parent_block, $next_block.
 *                                Its string return value will be appended to the serialized block markup.
 * @return string Serialized block markup.
 */
function traverse_and_serialize_blocks( $blocks, $pre_callback = null, $post_callback = null ) {
	$result       = '';
	$parent_block = null; // At the top level, there is no parent block to pass to the callbacks; yet the callbacks expect a reference.

	foreach ( $blocks as $index => $block ) {
		if ( is_callable( $pre_callback ) ) {
			$prev = 0 === $index
				? null
				: $blocks[ $index - 1 ];

			$result .= call_user_func_array(
				$pre_callback,
				array( &$block, &$parent_block, $prev )
			);
		}

		if ( is_callable( $post_callback ) ) {
			$next = count( $blocks ) - 1 === $index
				? null
				: $blocks[ $index + 1 ];

			$post_markup = call_user_func_array(
				$post_callback,
				array( &$block, &$parent_block, $next )
			);
		}

		$result .= traverse_and_serialize_block( $block, $pre_callback, $post_callback );
		$result .= isset( $post_markup ) ? $post_markup : '';
	}

	return $result;
}

/**
 * Filters and sanitizes block content to remove non-allowable HTML
 * from parsed block attribute values.
 *
 * @since 5.3.1
 *
 * @param string         $text              Text that may contain block content.
 * @param array[]|string $allowed_html      Optional. An array of allowed HTML elements and attributes,
 *                                          or a context name such as 'post'. See wp_kses_allowed_html()
 *                                          for the list of accepted context names. Default 'post'.
 * @param string[]       $allowed_protocols Optional. Array of allowed URL protocols.
 *                                          Defaults to the result of wp_allowed_protocols().
 * @return string The filtered and sanitized content result.
 */
function filter_block_content( $text, $allowed_html = 'post', $allowed_protocols = array() ) {
	$result = '';

	if ( str_contains( $text, '<!--' ) && str_contains( $text, '--->' ) ) {
		$text = preg_replace_callback( '%<!--(.*?)--->%', '_filter_block_content_callback', $text );
	}

	$blocks = parse_blocks( $text );
	foreach ( $blocks as $block ) {
		$block   = filter_block_kses( $block, $allowed_html, $allowed_protocols );
		$result .= serialize_block( $block );
	}

	return $result;
}

/**
 * Callback used for regular expression replacement in filter_block_content().
 *
 * @since 6.2.1
 * @access private
 *
 * @param array $matches Array of preg_replace_callback matches.
 * @return string Replacement string.
 */
function _filter_block_content_callback( $matches ) {
	return '<!--' . rtrim( $matches[1], '-' ) . '-->';
}

/**
 * Filters and sanitizes a parsed block to remove non-allowable HTML
 * from block attribute values.
 *
 * @since 5.3.1
 *
 * @param WP_Block_Parser_Block $block             The parsed block object.
 * @param array[]|string        $allowed_html      An array of allowed HTML elements and attributes,
 *                                                 or a context name such as 'post'. See wp_kses_allowed_html()
 *                                                 for the list of accepted context names.
 * @param string[]              $allowed_protocols Optional. Array of allowed URL protocols.
 *                                                 Defaults to the result of wp_allowed_protocols().
 * @return array The filtered and sanitized block object result.
 */
function filter_block_kses( $block, $allowed_html, $allowed_protocols = array() ) {
	$block['attrs'] = filter_block_kses_value( $block['attrs'], $allowed_html, $allowed_protocols, $block );

	if ( is_array( $block['innerBlocks'] ) ) {
		foreach ( $block['innerBlocks'] as $i => $inner_block ) {
			$block['innerBlocks'][ $i ] = filter_block_kses( $inner_block, $allowed_html, $allowed_protocols );
		}
	}

	return $block;
}

/**
 * Filters and sanitizes a parsed block attribute value to remove
 * non-allowable HTML.
 *
 * @since 5.3.1
 * @since 6.5.5 Added the `$block_context` parameter.
 *
 * @param string[]|string $value             The attribute value to filter.
 * @param array[]|string  $allowed_html      An array of allowed HTML elements and attributes,
 *                                           or a context name such as 'post'. See wp_kses_allowed_html()
 *                                           for the list of accepted context names.
 * @param string[]        $allowed_protocols Optional. Array of allowed URL protocols.
 *                                           Defaults to the result of wp_allowed_protocols().
 * @param array           $block_context     Optional. The block the attribute belongs to, in parsed block array format.
 * @return string[]|string The filtered and sanitized result.
 */
function filter_block_kses_value( $value, $allowed_html, $allowed_protocols = array(), $block_context = null ) {
	if ( is_array( $value ) ) {
		foreach ( $value as $key => $inner_value ) {
			$filtered_key   = filter_block_kses_value( $key, $allowed_html, $allowed_protocols, $block_context );
			$filtered_value = filter_block_kses_value( $inner_value, $allowed_html, $allowed_protocols, $block_context );

			if ( isset( $block_context['blockName'] ) && 'core/template-part' === $block_context['blockName'] ) {
				$filtered_value = filter_block_core_template_part_attributes( $filtered_value, $filtered_key, $allowed_html );
			}
			if ( $filtered_key !== $key ) {
				unset( $value[ $key ] );
			}

			$value[ $filtered_key ] = $filtered_value;
		}
	} elseif ( is_string( $value ) ) {
		return wp_kses( $value, $allowed_html, $allowed_protocols );
	}

	return $value;
}

/**
 * Sanitizes the value of the Template Part block's `tagName` attribute.
 *
 * @since 6.5.5
 *
 * @param string         $attribute_value The attribute value to filter.
 * @param string         $attribute_name  The attribute name.
 * @param array[]|string $allowed_html    An array of allowed HTML elements and attributes,
 *                                        or a context name such as 'post'. See wp_kses_allowed_html()
 *                                        for the list of accepted context names.
 * @return string The sanitized attribute value.
 */
function filter_block_core_template_part_attributes( $attribute_value, $attribute_name, $allowed_html ) {
	if ( empty( $attribute_value ) || 'tagName' !== $attribute_name ) {
		return $attribute_value;
	}
	if ( ! is_array( $allowed_html ) ) {
		$allowed_html = wp_kses_allowed_html( $allowed_html );
	}
	return isset( $allowed_html[ $attribute_value ] ) ? $attribute_value : '';
}

/**
 * Parses blocks out of a content string, and renders those appropriate for the excerpt.
 *
 * As the excerpt should be a small string of text relevant to the full post content,
 * this function renders the blocks that are most likely to contain such text.
 *
 * @since 5.0.0
 *
 * @param string $content The content to parse.
 * @return string The parsed and filtered content.
 */
function excerpt_remove_blocks( $content ) {
	if ( ! has_blocks( $content ) ) {
		return $content;
	}

	$allowed_inner_blocks = array(
		// Classic blocks have their blockName set to null.
		null,
		'core/freeform',
		'core/heading',
		'core/html',
		'core/list',
		'core/media-text',
		'core/paragraph',
		'core/preformatted',
		'core/pullquote',
		'core/quote',
		'core/table',
		'core/verse',
	);

	$allowed_wrapper_blocks = array(
		'core/columns',
		'core/column',
		'core/group',
	);

	/**
	 * Filters the list of blocks that can be used as wrapper blocks, allowing
	 * excerpts to be generated from the `innerBlocks` of these wrappers.
	 *
	 * @since 5.8.0
	 *
	 * @param string[] $allowed_wrapper_blocks The list of names of allowed wrapper blocks.
	 */
	$allowed_wrapper_blocks = apply_filters( 'excerpt_allowed_wrapper_blocks', $allowed_wrapper_blocks );

	$allowed_blocks = array_merge( $allowed_inner_blocks, $allowed_wrapper_blocks );

	/**
	 * Filters the list of blocks that can contribute to the excerpt.
	 *
	 * If a dynamic block is added to this list, it must not generate another
	 * excerpt, as this will cause an infinite loop to occur.
	 *
	 * @since 5.0.0
	 *
	 * @param string[] $allowed_blocks The list of names of allowed blocks.
	 */
	$allowed_blocks = apply_filters( 'excerpt_allowed_blocks', $allowed_blocks );
	$blocks         = parse_blocks( $content );
	$output         = '';

	foreach ( $blocks as $block ) {
		if ( in_array( $block['blockName'], $allowed_blocks, true ) ) {
			if ( ! empty( $block['innerBlocks'] ) ) {
				if ( in_array( $block['blockName'], $allowed_wrapper_blocks, true ) ) {
					$output .= _excerpt_render_inner_blocks( $block, $allowed_blocks );
					continue;
				}

				// Skip the block if it has disallowed or nested inner blocks.
				foreach ( $block['innerBlocks'] as $inner_block ) {
					if (
						! in_array( $inner_block['blockName'], $allowed_inner_blocks, true ) ||
						! empty( $inner_block['innerBlocks'] )
					) {
						continue 2;
					}
				}
			}

			$output .= render_block( $block );
		}
	}

	return $output;
}

/**
 * Parses footnotes markup out of a content string,
 * and renders those appropriate for the excerpt.
 *
 * @since 6.3.0
 *
 * @param string $content The content to parse.
 * @return string The parsed and filtered content.
 */
function excerpt_remove_footnotes( $content ) {
	if ( ! str_contains( $content, 'data-fn=' ) ) {
		return $content;
	}

	return preg_replace(
		'_<sup data-fn="[^"]+" class="[^"]+">\s*<a href="[^"]+" id="[^"]+">\d+</a>\s*</sup>_',
		'',
		$content
	);
}

/**
 * Renders inner blocks from the allowed wrapper blocks
 * for generating an excerpt.
 *
 * @since 5.8.0
 * @access private
 *
 * @param array $parsed_block   The parsed block.
 * @param array $allowed_blocks The list of allowed inner blocks.
 * @return string The rendered inner blocks.
 */
function _excerpt_render_inner_blocks( $parsed_block, $allowed_blocks ) {
	$output = '';

	foreach ( $parsed_block['innerBlocks'] as $inner_block ) {
		if ( ! in_array( $inner_block['blockName'], $allowed_blocks, true ) ) {
			continue;
		}

		if ( empty( $inner_block['innerBlocks'] ) ) {
			$output .= render_block( $inner_block );
		} else {
			$output .= _excerpt_render_inner_blocks( $inner_block, $allowed_blocks );
		}
	}

	return $output;
}

/**
 * Renders a single block into a HTML string.
 *
 * @since 5.0.0
 *
 * @global WP_Post $post The post to edit.
 *
 * @param array $parsed_block {
 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
 *
 *     @type string   $blockName    Name of block.
 *     @type array    $attrs        Attributes from block comment delimiters.
 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                  have the same structure as this one.
 *     @type string   $innerHTML    HTML from inside block comment delimiters.
 *     @type array    $innerContent List of string fragments and null markers where
 *                                  inner blocks were found.
 * }
 * @return string String of rendered HTML.
 */
function render_block( $parsed_block ) {
	global $post;
	$parent_block = null;

	/**
	 * Allows render_block() to be short-circuited, by returning a non-null value.
	 *
	 * @since 5.1.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param string|null   $pre_render   The pre-rendered content. Default null.
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$pre_render = apply_filters( 'pre_render_block', null, $parsed_block, $parent_block );
	if ( ! is_null( $pre_render ) ) {
		return $pre_render;
	}

	$source_block = $parsed_block;

	/**
	 * Filters the block being rendered in render_block(), before it's processed.
	 *
	 * @since 5.1.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param array         $source_block {
	 *     An un-modified copy of `$parsed_block`, as it appeared in the source content.
	 *     See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$parsed_block = apply_filters( 'render_block_data', $parsed_block, $source_block, $parent_block );

	$context = array();

	if ( $post instanceof WP_Post ) {
		$context['postId'] = $post->ID;

		/*
		 * The `postType` context is largely unnecessary server-side, since the ID
		 * is usually sufficient on its own. That being said, since a block's
		 * manifest is expected to be shared between the server and the client,
		 * it should be included to consistently fulfill the expectation.
		 */
		$context['postType'] = $post->post_type;
	}

	/**
	 * Filters the default context provided to a rendered block.
	 *
	 * @since 5.5.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param array         $context      Default context.
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$context = apply_filters( 'render_block_context', $context, $parsed_block, $parent_block );

	$block = new WP_Block( $parsed_block, $context );

	return $block->render();
}

/**
 * Parses blocks out of a content string.
 *
 * @since 5.0.0
 *
 * @param string $content Post content.
 * @return array[] {
 *     Array of block structures.
 *
 *     @type array ...$0 {
 *         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *         @type string   $blockName    Name of block.
 *         @type array    $attrs        Attributes from block comment delimiters.
 *         @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                      have the same structure as this one.
 *         @type string   $innerHTML    HTML from inside block comment delimiters.
 *         @type array    $innerContent List of string fragments and null markers where
 *                                      inner blocks were found.
 *     }
 * }
 */
function parse_blocks( $content ) {
	/**
	 * Filter to allow plugins to replace the server-side block parser.
	 *
	 * @since 5.0.0
	 *
	 * @param string $parser_class Name of block parser class.
	 */
	$parser_class = apply_filters( 'block_parser_class', 'WP_Block_Parser' );

	$parser = new $parser_class();
	return $parser->parse( $content );
}

/**
 * Parses dynamic blocks out of `post_content` and re-renders them.
 *
 * @since 5.0.0
 *
 * @param string $content Post content.
 * @return string Updated post content.
 */
function do_blocks( $content ) {
	$blocks = parse_blocks( $content );
	$output = '';

	foreach ( $blocks as $block ) {
		$output .= render_block( $block );
	}

	// If there are blocks in this content, we shouldn't run wpautop() on it later.
	$priority = has_filter( 'the_content', 'wpautop' );
	if ( false !== $priority && doing_filter( 'the_content' ) && has_blocks( $content ) ) {
		remove_filter( 'the_content', 'wpautop', $priority );
		add_filter( 'the_content', '_restore_wpautop_hook', $priority + 1 );
	}

	return $output;
}

/**
 * If do_blocks() needs to remove wpautop() from the `the_content` filter, this re-adds it afterwards,
 * for subsequent `the_content` usage.
 *
 * @since 5.0.0
 * @access private
 *
 * @param string $content The post content running through this filter.
 * @return string The unmodified content.
 */
function _restore_wpautop_hook( $content ) {
	$current_priority = has_filter( 'the_content', '_restore_wpautop_hook' );

	add_filter( 'the_content', 'wpautop', $current_priority - 1 );
	remove_filter( 'the_content', '_restore_wpautop_hook', $current_priority );

	return $content;
}

/**
 * Returns the current version of the block format that the content string is using.
 *
 * If the string doesn't contain blocks, it returns 0.
 *
 * @since 5.0.0
 *
 * @param string $content Content to test.
 * @return int The block format version is 1 if the content contains one or more blocks, 0 otherwise.
 */
function block_version( $content ) {
	return has_blocks( $content ) ? 1 : 0;
}

/**
 * Registers a new block style.
 *
 * @since 5.3.0
 * @since 6.6.0 Added support for registering styles for multiple block types.
 *
 * @link https://developer.wordpress.org/block-editor/reference-guides/block-api/block-styles/
 *
 * @param string|string[] $block_name       Block type name including namespace or array of namespaced block type names.
 * @param array           $style_properties Array containing the properties of the style name, label,
 *                                          style_handle (name of the stylesheet to be enqueued),
 *                                          inline_style (string containing the CSS to be added),
 *                                          style_data (theme.json-like array to generate CSS from).
 *                                          See WP_Block_Styles_Registry::register().
 * @return bool True if the block style was registered with success and false otherwise.
 */
function register_block_style( $block_name, $style_properties ) {
	return WP_Block_Styles_Registry::get_instance()->register( $block_name, $style_properties );
}

/**
 * Unregisters a block style.
 *
 * @since 5.3.0
 *
 * @param string $block_name       Block type name including namespace.
 * @param string $block_style_name Block style name.
 * @return bool True if the block style was unregistered with success and false otherwise.
 */
function unregister_block_style( $block_name, $block_style_name ) {
	return WP_Block_Styles_Registry::get_instance()->unregister( $block_name, $block_style_name );
}

/**
 * Checks whether the current block type supports the feature requested.
 *
 * @since 5.8.0
 * @since 6.4.0 The `$feature` parameter now supports a string.
 *
 * @param WP_Block_Type $block_type    Block type to check for support.
 * @param string|array  $feature       Feature slug, or path to a specific feature to check support for.
 * @param mixed         $default_value Optional. Fallback value for feature support. Default false.
 * @return bool Whether the feature is supported.
 */
function block_has_support( $block_type, $feature, $default_value = false ) {
	$block_support = $default_value;
	if ( $block_type instanceof WP_Block_Type ) {
		if ( is_array( $feature ) && count( $feature ) === 1 ) {
			$feature = $feature[0];
		}

		if ( is_array( $feature ) ) {
			$block_support = _wp_array_get( $block_type->supports, $feature, $default_value );
		} elseif ( isset( $block_type->supports[ $feature ] ) ) {
			$block_support = $block_type->supports[ $feature ];
		}
	}

	return true === $block_support || is_array( $block_support );
}

/**
 * Converts typography keys declared under `supports.*` to `supports.typography.*`.
 *
 * Displays a `_doing_it_wrong()` notice when a block using the older format is detected.
 *
 * @since 5.8.0
 *
 * @param array $metadata Metadata for registering a block type.
 * @return array Filtered metadata for registering a block type.
 */
function wp_migrate_old_typography_shape( $metadata ) {
	if ( ! isset( $metadata['supports'] ) ) {
		return $metadata;
	}

	$typography_keys = array(
		'__experimentalFontFamily',
		'__experimentalFontStyle',
		'__experimentalFontWeight',
		'__experimentalLetterSpacing',
		'__experimentalTextDecoration',
		'__experimentalTextTransform',
		'fontSize',
		'lineHeight',
	);

	foreach ( $typography_keys as $typography_key ) {
		$support_for_key = isset( $metadata['supports'][ $typography_key ] ) ? $metadata['supports'][ $typography_key ] : null;

		if ( null !== $support_for_key ) {
			_doing_it_wrong(
				'register_block_type_from_metadata()',
				sprintf(
					/* translators: 1: Block type, 2: Typography supports key, e.g: fontSize, lineHeight, etc. 3: block.json, 4: Old metadata key, 5: New metadata key. */
					__( 'Block "%1$s" is declaring %2$s support in %3$s file under %4$s. %2$s support is now declared under %5$s.' ),
					$metadata['name'],
					"<code>$typography_key</code>",
					'<code>block.json</code>',
					"<code>supports.$typography_key</code>",
					"<code>supports.typography.$typography_key</code>"
				),
				'5.8.0'
			);

			_wp_array_set( $metadata['supports'], array( 'typography', $typography_key ), $support_for_key );
			unset( $metadata['supports'][ $typography_key ] );
		}
	}

	return $metadata;
}

/**
 * Helper function that constructs a WP_Query args array from
 * a `Query` block properties.
 *
 * It's used in Query Loop, Query Pagination Numbers and Query Pagination Next blocks.
 *
 * @since 5.8.0
 * @since 6.1.0 Added `query_loop_block_query_vars` filter and `parents` support in query.
 *
 * @param WP_Block $block Block instance.
 * @param int      $page  Current query's page.
 *
 * @return array Returns the constructed WP_Query arguments.
 */
function build_query_vars_from_query_block( $block, $page ) {
	$query = array(
		'post_type'    => 'post',
		'order'        => 'DESC',
		'orderby'      => 'date',
		'post__not_in' => array(),
	);

	if ( isset( $block->context['query'] ) ) {
		if ( ! empty( $block->context['query']['postType'] ) ) {
			$post_type_param = $block->context['query']['postType'];
			if ( is_post_type_viewable( $post_type_param ) ) {
				$query['post_type'] = $post_type_param;
			}
		}
		if ( isset( $block->context['query']['sticky'] ) && ! empty( $block->context['query']['sticky'] ) ) {
			$sticky = get_option( 'sticky_posts' );
			if ( 'only' === $block->context['query']['sticky'] ) {
				/*
				 * Passing an empty array to post__in will return have_posts() as true (and all posts will be returned).
				 * Logic should be used before hand to determine if WP_Query should be used in the event that the array
				 * being passed to post__in is empty.
				 *
				 * @see https://core.trac.wordpress.org/ticket/28099
				 */
				$query['post__in']            = ! empty( $sticky ) ? $sticky : array( 0 );
				$query['ignore_sticky_posts'] = 1;
			} else {
				$query['post__not_in'] = array_merge( $query['post__not_in'], $sticky );
			}
		}
		if ( ! empty( $block->context['query']['exclude'] ) ) {
			$excluded_post_ids     = array_map( 'intval', $block->context['query']['exclude'] );
			$excluded_post_ids     = array_filter( $excluded_post_ids );
			$query['post__not_in'] = array_merge( $query['post__not_in'], $excluded_post_ids );
		}
		if (
			isset( $block->context['query']['perPage'] ) &&
			is_numeric( $block->context['query']['perPage'] )
		) {
			$per_page = absint( $block->context['query']['perPage'] );
			$offset   = 0;

			if (
				isset( $block->context['query']['offset'] ) &&
				is_numeric( $block->context['query']['offset'] )
			) {
				$offset = absint( $block->context['query']['offset'] );
			}

			$query['offset']         = ( $per_page * ( $page - 1 ) ) + $offset;
			$query['posts_per_page'] = $per_page;
		}
		// Migrate `categoryIds` and `tagIds` to `tax_query` for backwards compatibility.
		if ( ! empty( $block->context['query']['categoryIds'] ) || ! empty( $block->context['query']['tagIds'] ) ) {
			$tax_query = array();
			if ( ! empty( $block->context['query']['categoryIds'] ) ) {
				$tax_query[] = array(
					'taxonomy'         => 'category',
					'terms'            => array_filter( array_map( 'intval', $block->context['query']['categoryIds'] ) ),
					'include_children' => false,
				);
			}
			if ( ! empty( $block->context['query']['tagIds'] ) ) {
				$tax_query[] = array(
					'taxonomy'         => 'post_tag',
					'terms'            => array_filter( array_map( 'intval', $block->context['query']['tagIds'] ) ),
					'include_children' => false,
				);
			}
			$query['tax_query'] = $tax_query;
		}
		if ( ! empty( $block->context['query']['taxQuery'] ) ) {
			$query['tax_query'] = array();
			foreach ( $block->context['query']['taxQuery'] as $taxonomy => $terms ) {
				if ( is_taxonomy_viewable( $taxonomy ) && ! empty( $terms ) ) {
					$query['tax_query'][] = array(
						'taxonomy'         => $taxonomy,
						'terms'            => array_filter( array_map( 'intval', $terms ) ),
						'include_children' => false,
					);
				}
			}
		}
		if (
			isset( $block->context['query']['order'] ) &&
				in_array( strtoupper( $block->context['query']['order'] ), array( 'ASC', 'DESC' ), true )
		) {
			$query['order'] = strtoupper( $block->context['query']['order'] );
		}
		if ( isset( $block->context['query']['orderBy'] ) ) {
			$query['orderby'] = $block->context['query']['orderBy'];
		}
		if (
			isset( $block->context['query']['author'] )
		) {
			if ( is_array( $block->context['query']['author'] ) ) {
				$query['author__in'] = array_filter( array_map( 'intval', $block->context['query']['author'] ) );
			} elseif ( is_string( $block->context['query']['author'] ) ) {
				$query['author__in'] = array_filter( array_map( 'intval', explode( ',', $block->context['query']['author'] ) ) );
			} elseif ( is_int( $block->context['query']['author'] ) && $block->context['query']['author'] > 0 ) {
				$query['author'] = $block->context['query']['author'];
			}
		}
		if ( ! empty( $block->context['query']['search'] ) ) {
			$query['s'] = $block->context['query']['search'];
		}
		if ( ! empty( $block->context['query']['parents'] ) && is_post_type_hierarchical( $query['post_type'] ) ) {
			$query['post_parent__in'] = array_filter( array_map( 'intval', $block->context['query']['parents'] ) );
		}
	}

	/**
	 * Filters the arguments which will be passed to `WP_Query` for the Query Loop Block.
	 *
	 * Anything to this filter should be compatible with the `WP_Query` API to form
	 * the query context which will be passed down to the Query Loop Block's children.
	 * This can help, for example, to include additional settings or meta queries not
	 * directly supported by the core Query Loop Block, and extend its capabilities.
	 *
	 * Please note that this will only influence the query that will be rendered on the
	 * front-end. The editor preview is not affected by this filter. Also, worth noting
	 * that the editor preview uses the REST API, so, ideally, one should aim to provide
	 * attributes which are also compatible with the REST API, in order to be able to
	 * implement identical queries on both sides.
	 *
	 * @since 6.1.0
	 *
	 * @param array    $query Array containing parameters for `WP_Query` as parsed by the block context.
	 * @param WP_Block $block Block instance.
	 * @param int      $page  Current query's page.
	 */
	return apply_filters( 'query_loop_block_query_vars', $query, $block, $page );
}

/**
 * Helper function that returns the proper pagination arrow HTML for
 * `QueryPaginationNext` and `QueryPaginationPrevious` blocks based
 * on the provided `paginationArrow` from `QueryPagination` context.
 *
 * It's used in QueryPaginationNext and QueryPaginationPrevious blocks.
 *
 * @since 5.9.0
 *
 * @param WP_Block $block   Block instance.
 * @param bool     $is_next Flag for handling `next/previous` blocks.
 * @return string|null The pagination arrow HTML or null if there is none.
 */
function get_query_pagination_arrow( $block, $is_next ) {
	$arrow_map = array(
		'none'    => '',
		'arrow'   => array(
			'next'     => '→',
			'previous' => '←',
		),
		'chevron' => array(
			'next'     => '»',
			'previous' => '«',
		),
	);
	if ( ! empty( $block->context['paginationArrow'] ) && array_key_exists( $block->context['paginationArrow'], $arrow_map ) && ! empty( $arrow_map[ $block->context['paginationArrow'] ] ) ) {
		$pagination_type = $is_next ? 'next' : 'previous';
		$arrow_attribute = $block->context['paginationArrow'];
		$arrow           = $arrow_map[ $block->context['paginationArrow'] ][ $pagination_type ];
		$arrow_classes   = "wp-block-query-pagination-$pagination_type-arrow is-arrow-$arrow_attribute";
		return "<span class='$arrow_classes' aria-hidden='true'>$arrow</span>";
	}
	return null;
}

/**
 * Helper function that constructs a comment query vars array from the passed
 * block properties.
 *
 * It's used with the Comment Query Loop inner blocks.
 *
 * @since 6.0.0
 *
 * @param WP_Block $block Block instance.
 * @return array Returns the comment query parameters to use with the
 *               WP_Comment_Query constructor.
 */
function build_comment_query_vars_from_block( $block ) {

	$comment_args = array(
		'orderby'       => 'comment_date_gmt',
		'order'         => 'ASC',
		'status'        => 'approve',
		'no_found_rows' => false,
	);

	if ( is_user_logged_in() ) {
		$comment_args['include_unapproved'] = array( get_current_user_id() );
	} else {
		$unapproved_email = wp_get_unapproved_comment_author_email();

		if ( $unapproved_email ) {
			$comment_args['include_unapproved'] = array( $unapproved_email );
		}
	}

	if ( ! empty( $block->context['postId'] ) ) {
		$comment_args['post_id'] = (int) $block->context['postId'];
	}

	if ( get_option( 'thread_comments' ) ) {
		$comment_args['hierarchical'] = 'threaded';
	} else {
		$comment_args['hierarchical'] = false;
	}

	if ( get_option( 'page_comments' ) === '1' || get_option( 'page_comments' ) === true ) {
		$per_page     = get_option( 'comments_per_page' );
		$default_page = get_option( 'default_comments_page' );
		if ( $per_page > 0 ) {
			$comment_args['number'] = $per_page;

			$page = (int) get_query_var( 'cpage' );
			if ( $page ) {
				$comment_args['paged'] = $page;
			} elseif ( 'oldest' === $default_page ) {
				$comment_args['paged'] = 1;
			} elseif ( 'newest' === $default_page ) {
				$max_num_pages = (int) ( new WP_Comment_Query( $comment_args ) )->max_num_pages;
				if ( 0 !== $max_num_pages ) {
					$comment_args['paged'] = $max_num_pages;
				}
			}
			// Set the `cpage` query var to ensure the previous and next pagination links are correct
			// when inheriting the Discussion Settings.
			if ( 0 === $page && isset( $comment_args['paged'] ) && $comment_args['paged'] > 0 ) {
				set_query_var( 'cpage', $comment_args['paged'] );
			}
		}
	}

	return $comment_args;
}

/**
 * Helper function that returns the proper pagination arrow HTML for
 * `CommentsPaginationNext` and `CommentsPaginationPrevious` blocks based on the
 * provided `paginationArrow` from `CommentsPagination` context.
 *
 * It's used in CommentsPaginationNext and CommentsPaginationPrevious blocks.
 *
 * @since 6.0.0
 *
 * @param WP_Block $block           Block instance.
 * @param string   $pagination_type Optional. Type of the arrow we will be rendering.
 *                                  Accepts 'next' or 'previous'. Default 'next'.
 * @return string|null The pagination arrow HTML or null if there is none.
 */
function get_comments_pagination_arrow( $block, $pagination_type = 'next' ) {
	$arrow_map = array(
		'none'    => '',
		'arrow'   => array(
			'next'     => '→',
			'previous' => '←',
		),
		'chevron' => array(
			'next'     => '»',
			'previous' => '«',
		),
	);
	if ( ! empty( $block->context['comments/paginationArrow'] ) && ! empty( $arrow_map[ $block->context['comments/paginationArrow'] ][ $pagination_type ] ) ) {
		$arrow_attribute = $block->context['comments/paginationArrow'];
		$arrow           = $arrow_map[ $block->context['comments/paginationArrow'] ][ $pagination_type ];
		$arrow_classes   = "wp-block-comments-pagination-$pagination_type-arrow is-arrow-$arrow_attribute";
		return "<span class='$arrow_classes' aria-hidden='true'>$arrow</span>";
	}
	return null;
}

/**
 * Strips all HTML from the content of footnotes, and sanitizes the ID.
 *
 * This function expects slashed data on the footnotes content.
 *
 * @access private
 * @since 6.3.2
 *
 * @param string $footnotes JSON-encoded string of an array containing the content and ID of each footnote.
 * @return string Filtered content without any HTML on the footnote content and with the sanitized ID.
 */
function _wp_filter_post_meta_footnotes( $footnotes ) {
	$footnotes_decoded = json_decode( $footnotes, true );
	if ( ! is_array( $footnotes_decoded ) ) {
		return '';
	}
	$footnotes_sanitized = array();
	foreach ( $footnotes_decoded as $footnote ) {
		if ( ! empty( $footnote['content'] ) && ! empty( $footnote['id'] ) ) {
			$footnotes_sanitized[] = array(
				'id'      => sanitize_key( $footnote['id'] ),
				'content' => wp_unslash( wp_filter_post_kses( wp_slash( $footnote['content'] ) ) ),
			);
		}
	}
	return wp_json_encode( $footnotes_sanitized );
}

/**
 * Adds the filters for footnotes meta field.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_kses_init_filters() {
	add_filter( 'sanitize_post_meta_footnotes', '_wp_filter_post_meta_footnotes' );
}

/**
 * Removes the filters for footnotes meta field.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_remove_filters() {
	remove_filter( 'sanitize_post_meta_footnotes', '_wp_filter_post_meta_footnotes' );
}

/**
 * Registers the filter of footnotes meta field if the user does not have `unfiltered_html` capability.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_kses_init() {
	_wp_footnotes_remove_filters();
	if ( ! current_user_can( 'unfiltered_html' ) ) {
		_wp_footnotes_kses_init_filters();
	}
}

/**
 * Initializes the filters for footnotes meta field when imported data should be filtered.
 *
 * This filter is the last one being executed on {@see 'force_filtered_html_on_import'}.
 * If the input of the filter is true, it means we are in an import situation and should
 * enable kses, independently of the user capabilities. So in that case we call
 * _wp_footnotes_kses_init_filters().
 *
 * @access private
 * @since 6.3.2
 *
 * @param string $arg Input argument of the filter.
 * @return string Input argument of the filter.
 */
function _wp_footnotes_force_filtered_html_on_import_filter( $arg ) {
	// If `force_filtered_html_on_import` is true, we need to init the global styles kses filters.
	if ( $arg ) {
		_wp_footnotes_kses_init_filters();
	}
	return $arg;
}
ion Only return modules introduced before this version. Default is false, do not filter.
	 * @param bool|null   $requires_connection Pass a boolean value to only return modules that require (or do not require) a connection.
	 * @param bool|null   $requires_user_connection Pass a boolean value to only return modules that require (or do not require) a user connection.
	 *
	 * @return array $modules Array of module slugs
	 */
	public function get_available( $min_version = false, $max_version = false, $requires_connection = null, $requires_user_connection = null ) {
		static $modules = null;

		if ( ! class_exists( 'Jetpack' ) || ! Constants::is_defined( 'JETPACK__VERSION' ) || ! Constants::is_defined( 'JETPACK__PLUGIN_DIR' ) ) {
			return array_unique(
				/**
				 * Stand alone plugins need to use this filter to register the modules they interact with.
				 * This will allow them to activate and deactivate these modules even when Jetpack is not present.
				 * Note: Standalone plugins can only interact with modules that also exist in the Jetpack plugin, otherwise they'll lose the ability to control it if Jetpack is activated.
				 *
				 * @since 1.13.6
				 *
				 * @param array $modules The list of available modules as an array of slugs.
				 * @param bool $requires_connection Whether to list only modules that require a connection to work.
				 * @param bool $requires_user_connection Whether to list only modules that require a user connection to work.
				 */
				apply_filters( 'jetpack_get_available_standalone_modules', array(), $requires_connection, $requires_user_connection )
			);
		}

		if ( ! isset( $modules ) ) {
			$available_modules_option = \Jetpack_Options::get_option( 'available_modules', array() );
			// Use the cache if we're on the front-end and it's available...
			if ( ! is_admin() && ! empty( $available_modules_option[ JETPACK__VERSION ] ) ) {
				$modules = $available_modules_option[ JETPACK__VERSION ];
			} else {
				$files = ( new Files() )->glob_php( JETPACK__PLUGIN_DIR . 'modules' );

				$modules = array();

				foreach ( $files as $file ) {
					$slug    = $this->get_slug( $file );
					$headers = $this->get( $slug );

					if ( ! $headers ) {
						continue;
					}

					$modules[ $slug ] = $headers['introduced'];
				}

				\Jetpack_Options::update_option(
					'available_modules',
					array(
						JETPACK__VERSION => $modules,
					)
				);
			}
		}

		/**
		 * Filters the array of modules available to be activated.
		 *
		 * @since 2.4.0
		 *
		 * @param array $modules Array of available modules.
		 * @param string $min_version Minimum version number required to use modules.
		 * @param string $max_version Maximum version number required to use modules.
		 * @param bool|null $requires_connection Value of the Requires Connection filter.
		 * @param bool|null $requires_user_connection Value of the Requires User Connection filter.
		 */
		$mods = apply_filters( 'jetpack_get_available_modules', $modules, $min_version, $max_version, $requires_connection, $requires_user_connection );

		if ( ! $min_version && ! $max_version && $requires_connection === null && $requires_user_connection === null ) {
			return array_keys( $mods );
		}

		$r = array();
		foreach ( $mods as $slug => $introduced ) {
			if ( $min_version && version_compare( $min_version, $introduced, '>=' ) ) {
				continue;
			}

			if ( $max_version && version_compare( $max_version, $introduced, '<' ) ) {
				continue;
			}

			$mod_details = $this->get( $slug );

			if ( null !== $requires_connection && (bool) $requires_connection !== $mod_details['requires_connection'] ) {
				continue;
			}

			if ( null !== $requires_user_connection && (bool) $requires_user_connection !== $mod_details['requires_user_connection'] ) {
				continue;
			}

			$r[] = $slug;
		}

		return $r;
	}

	/**
	 * Is slug a valid module.
	 *
	 * @param string $module Module slug.
	 *
	 * @return bool
	 */
	public function is_module( $module ) {
		return ! empty( $module ) && ! validate_file( $module, $this->get_available() );
	}

	/**
	 * Update module status.
	 *
	 * @param string  $module - module slug.
	 * @param boolean $active - true to activate, false to deactivate.
	 * @param bool    $exit Should exit be called after deactivation.
	 * @param bool    $redirect Should there be a redirection after activation.
	 */
	public function update_status( $module, $active, $exit = true, $redirect = true ) {
		return $active ? $this->activate( $module, $exit, $redirect ) : $this->deactivate( $module );
	}

	/**
	 * Activate a module.
	 *
	 * @param string $module Module slug.
	 * @param bool   $exit Should exit be called after deactivation.
	 * @param bool   $redirect Should there be a redirection after activation.
	 *
	 * @return bool|void
	 */
	public function activate( $module, $exit = true, $redirect = true ) {
		/**
		 * Fires before a module is activated.
		 *
		 * @since 2.6.0
		 *
		 * @param string $module Module slug.
		 * @param bool $exit Should we exit after the module has been activated. Default to true.
		 * @param bool $redirect Should the user be redirected after module activation? Default to true.
		 */
		do_action( 'jetpack_pre_activate_module', $module, $exit, $redirect );

		if ( ! strlen( $module ) ) {
			return false;
		}

		// If it's already active, then don't do it again.
		$active = $this->get_active();
		foreach ( $active as $act ) {
			if ( $act === $module ) {
				return true;
			}
		}

		if ( ! $this->is_module( $module ) ) {
			return false;
		}

		// Jetpack plugin only
		if ( class_exists( 'Jetpack' ) ) {

			$module_data = $this->get( $module );

			$status = new Status();
			$state  = new CookieState();

			if ( ! \Jetpack::is_connection_ready() ) {
				if ( ! $status->is_offline_mode() && ! $status->is_onboarding() ) {
					return false;
				}

				// If we're not connected but in offline mode, make sure the module doesn't require a connection.
				if ( $status->is_offline_mode() && $module_data['requires_connection'] ) {
					return false;
				}
			}

			if ( class_exists( 'Jetpack_Client_Server' ) ) {
				$jetpack = \Jetpack::init();

				// Check and see if the old plugin is active.
				if ( isset( $jetpack->plugins_to_deactivate[ $module ] ) ) {
					// Deactivate the old plugins.
					$deactivated = array();
					foreach ( $jetpack->plugins_to_deactivate[ $module ] as $idx => $deactivate_me ) {
						if ( \Jetpack_Client_Server::deactivate_plugin( $deactivate_me[0], $deactivate_me[1] ) ) {
							// If we deactivated the old plugin, remembere that with ::state() and redirect back to this page to activate the module
							// We can't activate the module on this page load since the newly deactivated old plugin is still loaded on this page load.
							$deactivated[] = "$module:$idx";
						}
					}
					if ( $deactivated ) {
						$state->state( 'deactivated_plugins', implode( ',', $deactivated ) );
						wp_safe_redirect( add_query_arg( 'jetpack_restate', 1 ) );
						exit;
					}
				}
			}

			// Protect won't work with mis-configured IPs.
			if ( 'protect' === $module ) {
				if ( ! IP_Utils::get_ip() ) {
					$state->state( 'message', 'protect_misconfigured_ip' );
					return false;
				}
			}

			if ( ! Jetpack_Plan::supports( $module ) ) {
				return false;
			}

			// Check the file for fatal errors, a la wp-admin/plugins.php::activate.
			$state->state( 'module', $module );
			$state->state( 'error', 'module_activation_failed' ); // we'll override this later if the plugin can be included without fatal error.

			ob_start();
			$module_path = $this->get_path( $module );
			if ( file_exists( $module_path ) ) {
				require $this->get_path( $module ); // phpcs:ignore WordPressVIPMinimum.Files.IncludingFile.NotAbsolutePath
			}

			$active[] = $module;
			$this->update_active( $active );

			$state->state( 'error', false ); // the override.
			ob_end_clean();
		} else { // Not a Jetpack plugin.
			$active[] = $module;
			$this->update_active( $active );
		}

		if ( $redirect ) {
			wp_safe_redirect( ( new Paths() )->admin_url( 'page=jetpack' ) );
		}
		if ( $exit ) {
			exit;
		}
		return true;
	}

	/**
	 * Deactivate module.
	 *
	 * @param string $module Module slug.
	 *
	 * @return bool
	 */
	public function deactivate( $module ) {
		/**
		 * Fires when a module is deactivated.
		 *
		 * @since 1.9.0
		 *
		 * @param string $module Module slug.
		 */
		do_action( 'jetpack_pre_deactivate_module', $module );

		$active = $this->get_active();
		$new    = array_filter( array_diff( $active, (array) $module ) );

		return $this->update_active( $new );
	}

	/**
	 * Generate a module's path from its slug.
	 *
	 * @param string $slug Module slug.
	 */
	public function get_path( $slug ) {
		if ( ! Constants::is_defined( 'JETPACK__PLUGIN_DIR' ) ) {
			return '';
		}
		/**
		 * Filters the path of a modules.
		 *
		 * @since 7.4.0
		 *
		 * @param array $return The absolute path to a module's root php file
		 * @param string $slug The module slug
		 */
		return apply_filters( 'jetpack_get_module_path', JETPACK__PLUGIN_DIR . "modules/$slug.php", $slug );
	}

	/**
	 * Saves all the currently active modules to options.
	 * Also fires Action hooks for each newly activated and deactivated module.
	 *
	 * @param array $modules Array of active modules to be saved in options.
	 *
	 * @return bool $success true for success, false for failure.
	 */
	public function update_active( $modules ) {
		$current_modules      = \Jetpack_Options::get_option( 'active_modules', array() );
		$active_modules       = $this->get_active();
		$new_active_modules   = array_diff( $modules, $current_modules );
		$new_inactive_modules = array_diff( $active_modules, $modules );
		$new_current_modules  = array_diff( array_merge( $current_modules, $new_active_modules ), $new_inactive_modules );
		$reindexed_modules    = array_values( $new_current_modules );
		$success              = \Jetpack_Options::update_option( 'active_modules', array_unique( $reindexed_modules ) );
		// Let's take `pre_update_option_jetpack_active_modules` filter into account
		// and actually decide for which modules we need to fire hooks by comparing
		// the 'active_modules' option before and after the update.
		$current_modules_post_update = \Jetpack_Options::get_option( 'active_modules', array() );

		$new_inactive_modules = array_diff( $current_modules, $current_modules_post_update );
		$new_inactive_modules = array_unique( $new_inactive_modules );
		$new_inactive_modules = array_values( $new_inactive_modules );

		$new_active_modules = array_diff( $current_modules_post_update, $current_modules );
		$new_active_modules = array_unique( $new_active_modules );
		$new_active_modules = array_values( $new_active_modules );

		foreach ( $new_active_modules as $module ) {
			/**
			 * Fires when a specific module is activated.
			 *
			 * @since 1.9.0
			 *
			 * @param string $module Module slug.
			 * @param boolean $success whether the module was activated. @since 4.2
			 */
			do_action( 'jetpack_activate_module', $module, $success );
			/**
			 * Fires when a module is activated.
			 * The dynamic part of the filter, $module, is the module slug.
			 *
			 * @since 1.9.0
			 *
			 * @param string $module Module slug.
			 */
			do_action( "jetpack_activate_module_$module", $module );
		}

		foreach ( $new_inactive_modules as $module ) {
			/**
			 * Fired after a module has been deactivated.
			 *
			 * @since 4.2.0
			 *
			 * @param string $module Module slug.
			 * @param boolean $success whether the module was deactivated.
			 */
			do_action( 'jetpack_deactivate_module', $module, $success );
			/**
			 * Fires when a module is deactivated.
			 * The dynamic part of the filter, $module, is the module slug.
			 *
			 * @since 1.9.0
			 *
			 * @param string $module Module slug.
			 */
			do_action( "jetpack_deactivate_module_$module", $module );
		}

		return $success;
	}
}