Symfony\Component\Routing\Router::generate PHP Method

    public function generate($name, array $parameters = array(), $absolute = false)
    {
        return $this->getGenerator()->generate($name, $parameters, $absolute);
    }

 /**
  * @param $type
  * @param Router $router
  * @param ArrayCollection|Subject[] $subjects
  * @param int|null $parentId
  * @return string
  */
 public static function createSubjectTreeView($type, $router, $subjects, $parentId = null)
 {
     $tree = '<ul>%s</ul>';
     $item = '<li>%s</li>';
     $link = '<a href="%s">%s</a>';
     $items = "";
     /**
      * @var Subject $subject
      * @var ArrayCollection $children
      */
     foreach ($subjects as $subject) {
         if ($subject->getParent() === null || $subject->getParent()->getId() === $parentId) {
             if ($type == TreeHelper::SUBJECT_ADMIN) {
                 $path = $router->generate('ojs_admin_subject_show', ['id' => $subject->getId()]);
             } else {
                 $path = $router->generate('ojs_search_index', ['subject_filters' => $subject->getSubject()]);
             }
             $content = sprintf($link, $path, $subject->getSubject());
             $children = $subject->getChildren();
             if ($children->count() > 0) {
                 $content = $content . TreeHelper::createSubjectTreeView($type, $router, $children, $subject->getId());
             }
             $items = $items . sprintf($item, $content);
         }
     }
     return sprintf($tree, $items);
 }