Sulu\Bundle\CategoryBundle\Entity\CategoryRepositoryInterface::findChildrenCategoriesByParentId PHP Method

    public function findChildrenCategoriesByParentId($parentId = null);

 /**
  * {@inheritdoc}
  */
 public function findChildrenByParentId($parentId = null)
 {
     if ($parentId && !$this->categoryRepository->isCategoryId($parentId)) {
         throw new CategoryIdNotFoundException($parentId);
     }
     return $this->categoryRepository->findChildrenCategoriesByParentId($parentId);
 }