Problem: the token verification failed to be displayed in the Development of WeChat public platform.

The URL can normally access the documents provided by the public platform. {Code ...} the change position adds an if judgment at the beginning, and does not make any modifications to the google method or solve the problem. All posts are posted here. Thank you.

The URL can be accessed normally.
The document provided by the public platform is used.

  valid();    }else {    }class wechatCallbackapiTest{    public function valid()    {        $echoStr = $_GET["echostr"];        //valid signature , option        if($this->checkSignature()){            echo $echoStr;            exit;        }    }    public function responseMsg()    {        //get post data, May be due to the different environments        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];        //extract post data        if (!empty($postStr)){                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,                   the best way is to check the validity of xml by yourself */                libxml_disable_entity_loader(true);                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);                $fromUsername = $postObj->FromUserName;                $toUsername = $postObj->ToUserName;                $keyword = trim($postObj->Content);                $time = time();                $textTpl = "
                              
   %s
                               
   %s
                               
   
    %s
                               
   %s
                               
   %s
                               
   
    0
                               
  ";                             if(!empty( $keyword ))                {                    $msgType = "text";                    $contentStr = "Welcome to wechat world!";                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);                    echo $resultStr;                }else{                    echo "Input something...";                }        }else {            echo "";            exit;        }    }            private function checkSignature()    {        // you must define TOKEN by yourself        if (!defined("TOKEN")) {            throw new Exception('TOKEN is not defined!');        }                $signature = $_GET["signature"];        $timestamp = $_GET["timestamp"];        $nonce = $_GET["nonce"];                        $token = TOKEN;        $tmpArr = array($token, $timestamp, $nonce);        // use SORT_STRING rule        sort($tmpArr, SORT_STRING);        $tmpStr = implode( $tmpArr );        $tmpStr = sha1( $tmpStr );                if( $tmpStr == $signature ){            return true;        }else{            return false;        }    }}?>

The change position adds an if judgment at the beginning, and no modifications are made later.

I tried to solve the problem by google. I have posted all the posts here. Thank you.

Reply content:

The URL can be accessed normally.
The document provided by the public platform is used.

  valid();    }else {    }class wechatCallbackapiTest{    public function valid()    {        $echoStr = $_GET["echostr"];        //valid signature , option        if($this->checkSignature()){            echo $echoStr;            exit;        }    }    public function responseMsg()    {        //get post data, May be due to the different environments        $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];        //extract post data        if (!empty($postStr)){                /* libxml_disable_entity_loader is to prevent XML eXternal Entity Injection,                   the best way is to check the validity of xml by yourself */                libxml_disable_entity_loader(true);                $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);                $fromUsername = $postObj->FromUserName;                $toUsername = $postObj->ToUserName;                $keyword = trim($postObj->Content);                $time = time();                $textTpl = "
                              
   %s
                               
   %s
                               
   
    %s
                               
   %s
                               
   %s
                               
   
    0
                               
  ";                             if(!empty( $keyword ))                {                    $msgType = "text";                    $contentStr = "Welcome to wechat world!";                    $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);                    echo $resultStr;                }else{                    echo "Input something...";                }        }else {            echo "";            exit;        }    }            private function checkSignature()    {        // you must define TOKEN by yourself        if (!defined("TOKEN")) {            throw new Exception('TOKEN is not defined!');        }                $signature = $_GET["signature"];        $timestamp = $_GET["timestamp"];        $nonce = $_GET["nonce"];                        $token = TOKEN;        $tmpArr = array($token, $timestamp, $nonce);        // use SORT_STRING rule        sort($tmpArr, SORT_STRING);        $tmpStr = implode( $tmpArr );        $tmpStr = sha1( $tmpStr );                if( $tmpStr == $signature ){            return true;        }else{            return false;        }    }}?>

The change position adds an if judgment at the beginning, and no modifications are made later.

I tried to solve the problem by google. I have posted all the posts here. Thank you.

We also encountered this problem when learning. Please use a virtual space, Baidu app or Sina app's ECS. If it was mentioned by the former, you must complete real-name verification first. In this way, the annoying reminder can be removed and connected to the backend server.
If you still have other questions, continue to ask. Thank you.

phpif($_GET[echostr]){$wechatObj->valid();}else {    $wechatObj->responseMsg();//?}

Make sure that you have no output before echo $ echoStr...