function getRealURL($url) {
  $header = get_headers($url, 1);
  if (strpos($header[0], '301') || strpos($header[0], '302')) {
    if (is_array($header['Location'])) {
      return $header['Location'][count($header['Location']) - 1];
    } else {
      return $header['Location'];
    }
  } else {
    return $url;
  }
}