1.微信扫描 需要先 关注该公众账号，关注后自动跳转到指定url（在微信浏览器中打开的。）

 private function receiverEvent($object){
    $content = '';
    switch($object->Event){
        case "subscribe":
            $content = "你好"."\n";
            $content .=  "亲爱的，欢迎回家！"."\n";
            $content .= "<a href='wwww.baidu.com'>"."这是链接"."</a>"."\n";
            //如何在这里直接跳转到一个公众号内部的页面
            break;
        case "unsubscribe":
            $content = "";
            break;
    }//switch
    $result = $this->transmitText($object,$content);
    return $result;
}