haoshengxin/frontend/controllers/WechatController.php

<?php
namespace frontend\controllers;
use common\library\WeChat;
use Yii;
use yii\web\Controller;

/**
 * Site controller
 */
class WechatController extends Controller
{
    /**
     * @inheritdoc
     */
    public function actionIndex()
    {
        $wechat = new WeChat();
        $wechat->checkToken();
    }
}