tp5 无限极分类

public function getTrees($arr,$pid,$step = 0){

    global $tree;

    foreach($arr as $val) {

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

            $flag = str_repeat('-----------',$step);

            $val['cat_name'] = $flag.$val['cat_name'];

            $tree[] = $val;

            $this->getTrees($arr , $val['id'] ,$step+1);

        }

}

    return $tree;

}

$this->getTrees($result, 0, 0);