WordPress Version: 5.5
/**
* Determines whether the given ID is a nav menu item.
*
* @since 3.0.0
*
* @param int $menu_item_id The ID of the potential nav menu item.
* @return bool Whether the given ID is that of a nav menu item.
*/
function is_nav_menu_item($menu_item_id = 0)
{
return !is_wp_error($menu_item_id) && 'nav_menu_item' === get_post_type($menu_item_id);
}