token驗證失敗

微信公衆平臺後臺配置的時候出現“token驗證失敗”，如圖：

服務器程序如下：

    //檢查簽名
     public function checkSignature(Request $request)
     {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
        $echostr = $request->echostr;
        $token = config('wechat.token');
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode($tmpArr);
        $tmpStr = sha1($tmpStr);

        if($tmpStr == $signature){

            echo $echostr;
            exit();
            // return true;
        }else{

            return false;
        }
     }

後來從網上得知，需要使用ob_clean();，如下：

    //檢查簽名
     public function checkSignature(Request $request)
     {
        $signature = $_GET["signature"];
        $timestamp = $_GET["timestamp"];
        $nonce = $_GET["nonce"];
        $echostr = $request->echostr;
        $token = config('wechat.token');
        $tmpArr = array($token, $timestamp, $nonce);
        sort($tmpArr, SORT_STRING);
        $tmpStr = implode($tmpArr);
        $tmpStr = sha1($tmpStr);

        if($tmpStr == $signature){

            ob_clean();
            echo $echostr;
            exit();
            // return true;
        }else{

            return false;
        }
     }

Author:leedaning
本文地址：http://blog.csdn.net/leedaning/article/details/71194645