valid();}else{    $wechatObj->responseMsg();}class wechatCallbackapiTest{    public function valid()    {        $echoStr = $_GET["echostr"];        if($this->checkSignature()){            header('content-type:text');            echo $echoStr;            exit;        }    }    private function checkSignature()    {        $signature = $_GET["signature"];        $timestamp = $_GET["timestamp"];        $nonce = $_GET["nonce"];        $token = TOKEN;        $tmpArr = array($token, $timestamp, $nonce);        sort($tmpArr, SORT_STRING);        $tmpStr = implode( $tmpArr );        $tmpStr = sha1( $tmpStr );        if( $tmpStr == $signature ){            return true;        }else{            return false;        }    }    public function responseMsg()    {        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];        if (!empty($postStr)){            $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA); //获取数据            $fromUsername = $postObj->FromUserName;            $toUsername = $postObj->ToUserName;            $keyword = trim($postObj->Content);            $time = time();            $textTpl = "
                             
      
                              
      
                              
      
       %s
                              
      
                              
      
                              
      
       0
                              
     ";            if($keyword == "?" || $keyword == "？") //获取用户信息            {                $msgType = "text";                $contentStr = date("Y-m-d H:i:s",time()); // 回复的内容                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);                echo $resultStr;            }        }else{            echo "";            exit;        }    }}?>