delete_metadata_by_mid

Source code

function delete_metadata_by_mid( $meta_type, $meta_id ) {

	global $wpdb;



	// Make sure everything is valid.

	if ( ! $meta_type )

		return false;



	if ( ! $meta_id = absint( $meta_id ) )

		return false;



	if ( ! $table = _get_meta_table( $meta_type ) )

		return false;



	// object and id columns

	$column = esc_sql($meta_type . '_id');

	$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';



	// Fetch the meta and go on if it's found.

	if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) {

		$object_id = $meta->{$column};



		do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );



		if ( 'post' == $meta_type )

			do_action( 'delete_postmeta', $meta_id );



		// Run the query, will return true if deleted, false otherwise

		$result = (bool) $wpdb->query( $wpdb->prepare( "DELETE FROM $table WHERE $id_column = %d LIMIT 1;", $meta_id ) );



		// Clear the caches.

		wp_cache_delete($object_id, $meta_type . '_meta');



		do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value );