WP_REST_Menu_Items_Controller::get_menu_id() WordPress Method

	protected function get_menu_id( $menu_item_id ) {
		$menu_ids = wp_get_post_terms( $menu_item_id, 'nav_menu', array( 'fields' => 'ids' ) );
		$menu_id  = 0;
		if ( $menu_ids && ! is_wp_error( $menu_ids ) ) {
			$menu_id = array_shift( $menu_ids );
		}

		return $menu_id;
	}
Uses	Description
wp-includes/post.php:wp_get_post_terms()	Retrieves the terms for a post.
wp-includes/load.php:is_wp_error()	Checks whether the given variable is a WordPress Error.