Multiple options for decoding cached url's - php

Question

I have a script that needs to pull data from different cached URLs.
Right now $url = 'http://example.com/search.php?user=abc&part='.$part;
I need the portion of the script below modified to search multiple MD5 encrypted url's
i.e.
$url = 'http://example.com/search.php?user=abc&part='.$part;
$url = 'http://example.com/search.php?user=xyz&part='.$part;
$url = 'http://example.com/search.php?user=123&part='.$part;
If more than 1 value is returned than return the one with the newest date.
$xid needs to be the current setting for $url
Original code.
function get_cache_file($url) {
$xid = md5($url);
$gendir = CACHE_ROOT . substr($xid, 0, 1) . '/'. substr($xid, 1, 2);
if(!is_dir($gendir)) {
mkdir($gendir, 0777, true);
}
return $gendir . '/' . $xid;
}

Answer 1

Found an answer to the problem.
function get_cache_file($part)
{
$users = array('user1', 'user2', 'user3');
$file = '';
$time = 0;
foreach ($users as $user) {
$url = 'http://example.com/search.php?user=' . $user . '&part=' . $part;
$xid = md5($url);
$gendir = CACHE_ROOT . substr($xid, 0, 1) . '/' . substr($xid, 1, 2);
if (is_dir($gendir) && is_file($gendir . '/' . $xid)) {
if ($time < filemtime($file)) {
$time = filemtime($file);
$file = $gendir . '/' . $xid;
}
}
}