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define("TOKEN", "OLtrQuYoYinXamPL9o66BOpM9G");

$wechatObj = new wechatCallbackapiTest();

if (isset($_GET[*echostr*])) {

$wechatObj->valid();

}else{

$wechatObj->responseMsg();

}

class wechatCallbackapiTest

{

public function valid()

{

$echoStr = $_GET["echostr"];

if($this->checkSignature()){

echo $echoStr;

exit;

}

}

private function checkSignature()

{

$signature = $_GET["signature"];

$timestamp = $_GET["timestamp"];

$nonce = $_GET["nonce"];

$token = TOKEN;

$tmpArr = array($token, $timestamp, $nonce);

sort($tmpArr);

$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);

$fromUsername = $postObj->FromUserName;

$toUsername = $postObj->ToUserName;

$keyword = trim($postObj->Content);

$time = time();

$textTpl = "

%s

0

";

if($keyword == "?" || $keyword == "？")

{

$msgType = "text";

$contentStr = date("Y-m-d H:i:s",time());

$resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);

echo $resultStr;

}

}else{

echo "";

exit;

}

}

}

?>有大神能帮忙注释一下嘛