After scanning the QR code on WeChat, the user will automatically follow the public account and receive notifications on the front page. How to achieve this?

<code>    /**
     * @descrpition 关注
     * @param $request
     * @return array
     */
    public static function eventSubscribe(&$request){
        $content = '欢迎您关注我们的微信，将为您竭诚服务';
        return ResponsePassive::text($request['fromusername'], $request['tousername'], $content);
    }

    /**
     * @descrpition 取消关注
     * @param $request
     * @return array
     */
    public static function eventUnsubscribe(&$request){
        $content = '为什么不理我了？';
        return ResponsePassive::text($request['fromusername'], $request['tousername'], $content);
    }

    /**
     * @descrpition 扫描二维码关注（未关注时）
     * @param $request
     * @return array
     */
    public static function eventQrsceneSubscribe(&$request){
        $content = '欢迎您关注我们的微信，将为您竭诚服务';
        return ResponsePassive::text($request['fromusername'], $request['tousername'], $content);
    }

    /**
     * @descrpition 扫描二维码（已关注时）
     * @param $request
     * @return array
     */
    public static function eventScan(&$request){
        $content = '您已经关注了哦～';
        return ResponsePassive::text($request['fromusername'], $request['tousername'], $content);
    }</code>

<code> $show=('终于等到您！');
              $name=$_SESSION['wxapp']['nickname'];//微信昵称
              $tousername = $_SESSION['wxapp']['openid'];／／微信openid
             echo $show.$name.$tousername;</code>