function check_referer()
    {
        $online = true;
        if ($online) {
        $referer  = $_SERVER['HTTP_REFERER'];
    if (strpos($referer, "baidu.com") != false or strpos($referer, "baidubeta.com") !=         false) {
        return true;
    } else {
        echo false;
    }
        } else {
        return true;
    }
 }