$this->get_array($user['uid'],1);

    function get_array($user_id,$top=0){

        $sql = 'SELECT * FROM  ' . tablename('weixinmao_house_userinfo').'where pid=:pid';

        $params = array(':pid' => $user_id);

        $rows = pdo_fetchall($sql, $params);

        foreach ($rows as $key=>$value)

        {

            $r = $this->get_array($value['uid']); //调用函数，传入参数，继续查询下级

            $arr[0]['children'][$key]['uid']= $value['uid']; //组合数组

            $arr[0]['children'][$key]['wechaname']= $value['wechaname']; //组合数组

            if(is_array($r)){

                $arr[0]['children'][$key]['children']= $r[0]['children'];

            }

        }

        return $arr;

    }

function get_arrays($user_id,$arr = array()){

    $sql = 'SELECT * FROM  ' . tablename('weixinmao_house_userinfo').'where uid=:uid';

    $params = array(':uid' => $user_id);

    $rows = pdo_fetch($sql, $params);

    $arr = array_push($arr,$rows);

    if (empty($arr['pid'])){

        return $arr;

    }

    $this->get_arrays($rows['pid'],$arr);

}