huahuibao/app/mobile/controllers/ErrorController.php

<?php

namespace mobile\controllers;
use Yii;
use yii\web\Controller;

class ErrorController extends MobileendController
{
    public function actionErrorPage(){
        $statusCode = Yii::$app->request->get('statusCode');

        switch ($statusCode){
            case 'illegalMerchantId':
                $title = '非法访问';
                $msg = '您访问的数据出现异常!';
                break;

            case 'illegalData':
                $title = '访问数据不存在';
                $msg = '您访问的数据出现异常!';
                break;
        }
        return $this->render('error', ['title'=>$title, 'msg'=>$msg]);
    }
}