function saveLog($sMessage)
{
    if(is_writable(getcwd())) {
        $rF = fopen("log_ddos.txt","a+");
        $sText = date("r")." ".$sMessage."\r\n";
        flock($rF, LOCK_EX);
        fwrite($rF,$sText);
        flock($rF, LOCK_UN);
        fclose($rF);
    }
}

saveLog($_SERVER['REMOTE_ADDR']);