PHP微信开发：订阅事件

define("TOKEN", "linuxany.com");
$wechatObj = new wechatCallbackapiTest();
$wechatObj->responseMsg();

class wechatCallbackapiTest
{
    public function responseMsg()
    {
        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
        if (!empty($postStr)){
            $postObj = simplexml_load_string($postStr,'SimpleXMLElement', LIBXML_NOCDATA);
            $RX_TYPE = trim($postObj->MsgType);
 
            switch ($RX_TYPE)
            {
                case "text":
                    $resultStr = $this->receiveText($postObj);
                    break;
                case "event":
                    $resultStr = $this->receiveEvent($postObj);
                    break;
                default:
                    $resultStr = "unknow msg type: ".$RX_TYPE;
                    break;
            }
            echo $resultStr;
        }else {
            echo "";
            exit;
        }
    }
 
    private function receiveText($object)
    {
        $funcFlag = 0;
        $keyword = trim($object->Content);
        $resultStr = "";
        $cityArray = array();
        $contentStr = "";
        $needArray = false;
        $illegal = false;
        $saytome = false;
       
        if ($keyword == "Hello2BizUser"){
            $contentStr = "欢迎关注Linuxany.COM";
            $resultStr = $this->transmitText($object, $contentStr,$funcFlag);
            return $resultStr;
        }else {
       
        }
    }
 
    private function receiveEvent($object)
    {
        $contentStr = "";
        switch ($object->Event)
        {
            case "subscribe":
                $contentStr = "您好，欢迎Linuxany.COM！";
                break;
        }
        $resultStr = $this->transmitText($object, $contentStr);
        return $resultStr;
    }
   
    private function transmitText($object, $content, $flag = 0)
    {
        $textTpl = "<xml>
<ToUserName><![CDATA[%s]]></ToUserName>
<FromUserName><![CDATA[%s]]></FromUserName>
<CreateTime>%s</CreateTime>
<MsgType><![CDATA[text]]></MsgType>
<Content><![CDATA[%s]]></Content>
<FuncFlag>%d</FuncFlag>
</xml>";
        $resultStr = sprintf($textTpl, $object->FromUserName, $object->ToUserName, time(), $content, $flag);
        return $resultStr;
    }
}