Returning an instance of a node itself in a php tree class -

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so i'm trying create tree structure in php. don't know if that's possible , i'm not great php difficult me.

the code have far (important stuff only, code has been cut out):

abstract class tree_node {     protected $_child_refs = array();      abstract public function add_child($arg);      public function count() {         return count($this->_child_refs);     }      public function get_deepest_children() {         if ($this->count() === 0) {             return $this;         } else {             foreach ($this->_child_refs $child_ref) {                 $deepest[] = $child_ref->get_deepest_children();             }         }     }      abstract public function __construct(); }  class data_node extends tree_node {     private $_data = "";      public function add_child($data) {         $new_child = new data_node($data);         $this->_child_refs[] = $new_child;     }      public function __construct($data) {         $this->_data = $data;     } }  $foo = new data_node("foo"); $foo->add_child("bar");  var_dump($foo->get_deepest_children());

this code should return data_node "bar" data instead null. what's wrong "return $this"? not proper way return instance of class itself?

also, feel free critique code/tell me i'm doing wrong. want keep tree functions separate functions specific data stored in tree, why split 2 classes, if think that's bad idea tell me.

this:

public function get_deepest_children() {     if ($this->count() === 0) {         return $this;     } else {         foreach ($this->_child_refs $child_ref) {             $deepest[] = $child_ref->get_deepest_children();         }     } }

should this:

public function get_deepest_children() {     if ($this->count() === 0) {         return array($this);     }     $deepest = array();     foreach ($this->_child_refs $child_ref) {         $deepest = array_merge($deepest,$child_ref->get_deepest_children());     }     return $deepest; }

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