_wp_preview_meta_filter() │ WP 6.4.0

Filters preview post meta retrieval to get values from the autosave.

Filters revisioned meta keys only.

No Hooks.

Return

Mixed. Original meta value if the meta key isn't revisioned, the object doesn't exist, the post type is a revision or the post ID doesn't match the object ID. Otherwise, the revisioned meta value is returned for the preview.

Usage

_wp_preview_meta_filter( $value, $object_id, $meta_key, $single );

$value(mixed) (required)

Meta value to filter.

$object_id(int) (required)

Object ID.

$meta_key(string) (required)

Meta key to filter a value for.

$single(true|false) (required)

Whether to return a single value.
Default: false

Changelog

_wp_preview_meta_filter() wp preview meta filter code ^{WP 6.6.2}

function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) {

	$post = get_post();
	if (
		empty( $post ) ||
		$post->ID !== $object_id ||
		! in_array( $meta_key, wp_post_revision_meta_keys( $post->post_type ), true ) ||
		'revision' === $post->post_type
	) {
		return $value;
	}

	$preview = wp_get_post_autosave( $post->ID );
	if ( false === $preview ) {
		return $value;
	}

	return get_post_meta( $preview->ID, $meta_key, $single );
}