php无限分类二

/**
     * 所有分类数据
     * */
    public function categoryData(){
        $order = ‘id,sort asc‘;
        $res = $this->db->cache($this->cache)->order($order)->select();
        return $data;
    }

Array
(
    [1] => Array
        (
            [id] => 1
            [pid] => 0
            [name] => 新闻40
            [desc] => 
            [is_delete] => 
            [add_time] => 1494938181
        )

    [2] => Array
        (
            [id] => 2
            [pid] => 0
            [name] => 图片
            [desc] => 234234
            [is_delete] => 
            [add_time] => 1494938210
        )

    [3] => Array
        (
            [id] => 3
            [pid] => 5
            [name] => 234234
            [desc] => 234
            [is_delete] => 
            [add_time] => 1494938931
        )

    [4] => Array
        (
            [id] => 4
            [pid] => 1
            [name] => 234234
            [desc] => 
            [is_delete] => 
            [add_time] => 
        )

    [5] => Array
        (
            [id] => 5
            [pid] => 4
            [name] => 第4级分类
            [desc] => 
            [is_delete] => 
            [add_time] => 
        )

    [6] => Array
        (
            [id] => 6
            [pid] => 1
            [name] => 12312
            [desc] => 3123123
            [is_delete] => 
            [add_time] => 1494943856
        )

)

 /**
     * 子分类列表
     * */
    public function pidData($pid=null){
        $result =‘‘;
        $arr = $this->categoryData();
        foreach($arr as $k=>$v){
            if($v[‘pid‘] == $pid){
                $result[$v[‘id‘]] = $v;
            }
        }
        return $result;
    }

 /**
     * 分类树
     * */
    public function tree($pid=0){
        $res = $this->pidData($pid);
        if(empty($res)) return false;
        foreach($res as $k=>$v){
            $result[$v[‘id‘]] = $v;

            $rf = $this->tree($v[‘id‘]);
            if($rf){
                foreach($rf as $k=>$vv){
                    $result[$vv[‘id‘]][‘id‘] = $vv[‘id‘];
                    $result[$vv[‘id‘]][‘name‘] = "   |- ".$vv[‘name‘];
                    $result[$vv[‘id‘]][‘pid‘] = $vv[‘pid‘];
                }
            }
        }
        return $result;
    }

Array
(
    [1] => Array
        (
            [id] => 1
            [pid] => 0
            [name] => 新闻40
            [desc] => 
            [is_delete] => 
            [add_time] => 1494938181
        )

    [4] => Array
        (
            [id] => 4
            [name] =>    |- 234234
            [pid] => 1
        )

    [5] => Array
        (
            [id] => 5
            [name] =>    |-    |- 第4级分类
            [pid] => 4
        )

    [3] => Array
        (
            [id] => 3
            [name] =>    |-    |-    |- 234234
            [pid] => 5
        )

    [6] => Array
        (
            [id] => 6
            [name] =>    |- 12312
            [pid] => 1
        )

    [2] => Array
        (
            [id] => 2
            [pid] => 0
            [name] => 图片
            [desc] => 234234
            [is_delete] => 
            [add_time] => 1494938210
        )

)