php--yii2框架错误提示

if($code!=200){
$user=new UserAuth();
$user->mobile=$register['mobile'];
$user->password=md5($register['password']);
$user->username=$register['username'];
$authKey=$this->getRandChar(5);
$user->authKey=$authKey;
$user->accessToken=md5($authKey);
//yii2 错误提示
if (!$user->hasErrors() && $user->save()) {
        JsonLib::show(1105,'用户注册成功');
    } else {
        print_r($user->getErrors());//打印错误
exit();
    }
}else{
    JsonLib::show(1204,'验证码不正确');
}