thinkphp3.2数据的更新

$ms = M("user"); // 实例化User对象
        $data['name'] = $_POST['name'];
        $id = $_POST['id'];
        $data['pwd'] = md5($_POST['pwd']);
        $data['tel'] = $_POST['tel'];
        $data['sex'] = $_POST['sex'];
        $data['email'] = $_POST['email'];
        $res = $ms->where("id='$id'")->save($data);
//        dump($res);die;
        if($res){
            $this->success('修改成功',U('User/index'));
        }else{
            $this->error('修改失败',U('User/index'));
        }