可以再models类里面定义
你看看下面代码，希望可以帮助到你

public function rules()

{
    return [
        // name, email, subject and body are required
        [['username'], 'required','message'=>'用户名不能为空'],
        [[ 'password'], 'required','message'=>'密码不能为空'],
        // verifyCode needs to be entered correctly
        ['verifyCode', 'required','message'=>'验证码不能为空'],
        ['verifyCode', 'captcha','message'=>'验证码不正确'],
    ];
}

<?= \Yii::$app->urlManager->createUrl(['index/info', 'paper' =>1]) ?>