function check() {        if (!isset($_SERVER[‘PHP_AUTH_USER‘])) {        header(‘WWW-Authenticate: Basic realm="My Realm"‘);        header(‘HTTP/1.0 401 Unauthorized‘);        //             echo ‘Text to send if user hits Cancel button‘;        exit;    }        if(!($_SERVER[‘PHP_AUTH_USER‘] == ‘mysql‘ &&  $_SERVER[‘PHP_AUTH_PW‘] == ‘wenxue‘))    {        exit;    }    }check();