gzencode and stream http archive

function stream_gzencode($input) {
  $size = strlen($input); 
  $crc = crc32($input);
  $gzdata = "\x1f\x8b\x08\x00\x00\x00\x00\x00".substr(gzcompress($input, 9), 0, -4).pack('V', $crc).pack('V', $size);
  header('Content-Encoding: gzip');
  header('Content-Length: '.strlen($gzdata));
  header('Content-type: application/x-gzip');
  die($gzdata);
}