PHP Recursive File Modified Check

<?php
function latest($searchDir, array $files = array()) {
    $search = opendir($searchDir);

    $dirs = array();
    while($item = readdir($search)) {
        if ($item == '.' || $item == '..') { continue; }
        if (is_dir($searchDir.'/'.$item)) {
            $dirs[] = $searchDir.'/'.$item;
        }
        if (is_file($searchDir.'/'.$item)) {
            $ftime = filemtime($searchDir.'/'.$item);
            $files[$ftime] = $searchDir.'/'.$item;
        }
    }
    closedir($search);
    if (count($dirs) > 0) {
        foreach ($dirs as $dir) {
            $files += latest($dir,$files);
        }
    }
    krsort($files);
    $files = array_slice($files, 0, 100, true);
    return $files;
}
if (current_user_can( 'manage_options' )) {
    foreach(latest($_SERVER['DOCUMENT_ROOT']) as $time => $file){
        echo date ("F d Y H:i:s.", $time) . ': ' . $file . '</br>';
    };
}
exit;
?>