微信公众号服务器配置（校验）

public function serve(){    $echoStr = $_GET["echostr"];    if($this->checkSignature()){        echo $echoStr;        exit;    }}//检查签名private function checkSignature(){    $signature = $_GET["signature"];    $timestamp = $_GET["timestamp"];    $nonce = $_GET["nonce"];    $token = "xxxxxxxxxxx";    $tmpArr = array($token, $timestamp, $nonce);    sort($tmpArr, SORT_STRING);    $tmpStr = implode($tmpArr);    $tmpStr = sha1($tmpStr);    if($tmpStr == $signature){        return true;    }else{        return false;    }}