metadata_exists() │ WP 3.3.0

Determines if a meta field with the given key exists for the given object ID.

Return

true|false. Whether a meta field with the given key exists.

Usage

metadata_exists( $meta_type, $object_id, $meta_key );

$meta_type(string) (required)

Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.

$object_id(int) (required)

ID of the object metadata is for.

$meta_key(string) (required)

Metadata key.

Changelog

metadata_exists() metadata exists code ^{WP 6.6.2}

function metadata_exists( $meta_type, $object_id, $meta_key ) {
	if ( ! $meta_type || ! is_numeric( $object_id ) ) {
		return false;
	}

	$object_id = absint( $object_id );
	if ( ! $object_id ) {
		return false;
	}

	/** This filter is documented in wp-includes/meta.php */
	$check = apply_filters( "get_{$meta_type}_metadata", null, $object_id, $meta_key, true, $meta_type );
	if ( null !== $check ) {
		return (bool) $check;
	}

	$meta_cache = wp_cache_get( $object_id, $meta_type . '_meta' );

	if ( ! $meta_cache ) {
		$meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
		$meta_cache = $meta_cache[ $object_id ];
	}

	if ( isset( $meta_cache[ $meta_key ] ) ) {
		return true;
	}

	return false;
}