Help me sort files by date?

I'm displaying the contents of a folder, with each file clickable.

I can't seem to get it to sort by file date, with the most current on top (descending).

What am I missing here?

<?php

echo "<h1>File Listing</h1>";

$content_array = array();


$path = "../FOLDER/Subfolder/";

$dh = opendir($path);

$handle=opendir($dirname);
$i=0;
while (($file = readdir($dh)) !== false) {


if ($file != "." && $file != "..")
{
       $content_array[$i][0] = $file;
       $content_array[$i][1] = date ("Y m d", filemtime($dirname."/".$file));
        $i++;
}

foreach($content_array as $res)
       $sortAux[] = $res[1];
    array_multisort($sortAux, SORT_DESC, $content_array);

    echo "<a href='$path/$file' target=\"\_blank>$file</a><br />";
}
closedir($dh);
?>