PHP Zip File Empty?
<p>I have a script that creates a zip files from files in a certain directory. After Download, for a lot of users - the zip file is empty. However, for other users - the file isn't empty. Is it something I'm doing wrong?</p>

<pre><code>header('Content-type: application/zip');
header('Content-Disposition: attachment; filename="'.$id.'.zip"');
header('Cache-Control: private');
ob_clean();
flush();
readfile("".$id.".zip");
exit;
</code></pre>
