Træ struktur?

PHP kode 

 <?php
     class TreeNode
     {
         public $children = array();
         
         function __construct($d){
             foreach($d as $key => $val){
                 $this->{$key} = $val;
             }
             
             if($this->children){
                 $a = $this->children;
                 $this->children = array();
                 foreach($a as $r){
                     $this->add(new TreeNode($r));
                 }
             }
         }
         
         function add(TreeNode $node) {
             $this->children[] = $node;
         }
         
         function findBy($key,$value){            
             if($this->{$key} == $value) {
                 return $this;
             } else {
                 foreach($this->children as $node){
                     if(($n = $node->findBy($key,$value)) !== false){
                         return $n;
                     }
                 }
             }
             
             return false;
         }
     }
     
     $data = array(
         'text' => 'Root',
         'children' => array(
             array('text' => 'node1'),
             array('text' => 'node2','children' => array(
                 array('text' => 'node2-1'),
                 array('text' => 'node2-2')
             )),
             array('text' => 'node3')
         )
     );
     
     $root = new TreeNode($data);    
     $node = $root->findBy('text','node2-2');
     print_r($node);
 ?>