PHP递归方法

public function catSort($arr，$pid=0，$lev=0) {

        foreach($arr as $v) {

            if($v['parent_id'] == $pid) {

                $v['lev'] = $lev;

                $this->cateList[] = $v;

                $this->catSort($arr，$v['cat_id']，$lev+1);

            }

        }

    }