Денис Лабутин

public function exceptChild($data,$rootID){
        foreach($data as $id => $node){
            if($node->parent_id == $rootID){
                unset($data[$id]);
                $data = $this->exceptChild($data,$node->id);
            }
        }
        return $data;
    }

$data = $model->exceptChild($model->findAll('id !='.$id),$id);