Method countMenuChildren

/**
 * Count the number of child menu items of the current active menu item
 *
 * @return  integer  Number of child menu items
 *
 * @since   1.7.0
 */
public function countMenuChildren()
{
    static $children;
    if (!isset($children)) {
        $db = CmsFactory::getDbo();
        $app = CmsFactory::getApplication();
        $menu = $app->getMenu();
        $active = $menu->getActive();
        $children = 0;
        if ($active) {
            $query = $db->getQuery(true)->select('COUNT(*)')->from($db->quoteName('#__menu'))->where([$db->quoteName('parent_id') . ' = :id', $db->quoteName('published') . ' = 1'])->bind(':id', $active->id, ParameterType::INTEGER);
            $db->setQuery($query);
            $children = $db->loadResult();
        }
    }
    return $children;
}