PHP force download of remote file without reading into memory

2018-06-23 09:29:15

Is it possible to force a download of remote file in PHP without reading it into memory? I know fpassthru(), readfile(), file_get_contents() all reads the files into memory before outputting it into the browser.

Here's my code:

if($url = getRemoteFileURL($file_id))
{
  header('Content-Type: application/octet-stream');
  header('Content-Disposition: attachment; filename="abc.zip"');
  header('Content-Transfer-Encoding: binary');
  header('Expires: 0');
  header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
  header('Pragma: public');
  header('Pragma: no-cache');

  readfile($url);  // is there a better function ?
}

I don't want to do header("Location: ") because that would reveal the URL

If you do a header("Location: ..."); to a downloaded file, the URL isn't actually revealed much, if at all.

Anyway, readfile is probably your best option. I would assume, given that it writes straight to the output, that PHP proceeds by reading in a part of the file, then outputting it, then reading the next part, etc., overall using very little memory.

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