recursive function

public $parents = array();
function loadParent($post=NULL){
	if ($post === NULL) $post = $this;
	$post->parents[] = $post;
	if (!$post->d_rootId){
		return $post;	
	}else{ 
		$return=$post->findone(['d_id = ?',$post->d_rootId]); 
		return $this->loadParent($return);
	} 
}