public function weixinQr($sence_id, $expire_seconds = 0)
 {
     $wechatauth = new WechatAuth(C('WEIXIN.APPID'), C('WEIXIN.SECRET'));
     $result = $wechatauth->qrcodeCreate($sence_id, $expire_seconds);
     if (isset($result['errcode'])) {
         return false;
     } else {
         return $wechatauth->showqrcode($result['ticket']);
     }
 }