원격 파일을 다운로드하지 않고 크기를 어떻게 알 수 있나요?

function get_remote_file_size($url) {
  $curl = curl_init($url);
  curl_setopt($curl, CURLOPT_NOBODY, true);
  curl_setopt($curl, CURLOPT_HEADER, true);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);

  $data = curl_exec($curl);
  curl_close($curl);

  if ($data) {
    preg_match("/Content-Length: (\d+)/", $data, $matches);
    $content_length = $matches[1] ?? -1;
    return $content_length;
  }

  return -1;
}

$file_size = get_remote_file_size("http://my_url/my_file.txt");