Networking\InitCmsBundle\Model\MenuItemInterface::getId PHP Method

    public function getId();

 /**
  * @param  MenuItemInterface $menuItem
  * @return MenuItemInterface
  */
 public function getRootParent(MenuItemInterface $menuItem)
 {
     if (!$menuItem->getId()) {
         return false;
     }
     if ($parent = $menuItem->getParent()) {
         return $this->getRootParent($parent);
     }
     return $menuItem;
 }