define("TOKEN","xxxxx");/ 后臺填寫的token$wechatObj = new wechatAPI();$wechatObj->isValid();class wechatAPI{public function isValid()//驗證微信接口，如果確認是微信就返回它傳來的echostr參數{ $echoStr = $_GET["echostr"]; if ($this->checkSignature()) { echo $echoStr; exit; }}private function checkSignature() //官方的驗證函數{ $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; }}};