Changing CRC of a file through readfile()

I have this code set up that lets a user download a file through my server from a URL they specify. The file streams through using readfile() so it only uses my bandwidth.

<?php

set_time_limit(0);

$urlParts = explode("/", $_SERVER['PHP_SELF']);
$file = $urlParts[3];

header("Cache-Control: public, must-revalidate");
header("Pragma: hack");
header("Content-Type: application/force-download");
header('Content-Disposition: attachment; filename=' . $file);
header("Content-Transfer-Encoding: binary\n");
readfile($file);

?>

This script works, but it does not change the CRC hash of the downloaded file. What I want it to do is append some random bits to the end of the file so it can change the hash without corrupting it. I have tried adding something like echo md5(rand() . time()); to the end of the script but it doesn't work.

If this is possible with something like cURL I'd appreciate if someone could put up some code samples, because i'd switch to cURL if this was possible.

Thanks for your help.

ansaurus

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Changing CRC of a file through readfile()

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