简单直接的无限极分类（基于thinkphp）

public function tree(){        $goods_category = M('GoodsCategory');        $data = $goods_category->order('id desc')->select();        $res=$this->tree_array($data);        dump($res);    }    /*     * $data 需要进行格式化的数组     * $pid 父id     * */    public function tree_array(&$data){        foreach ($data as $k => $v){            if ($v['pid'] != 0){                foreach ($data as $kk => $vv){                    if ($vv['id'] == $v['pid']){                        $data[$kk]['son'][] = $v;                        unset($data[$k]);                    }                }            }        }        return $data;    }