Scan dir sorted on modified date

scan_dir.php

function scan_dir($dir) {
    $ignored = array('.', '..', '.svn', '.htaccess'); // -- ignore these file names
    $files = array(); //----------------------------------- create an empty files array to play with
    foreach (scandir($dir) as $file) {
        if ($file[0] === '.') continue; //----------------- ignores all files starting with '.'
        if (in_array($file, $ignored)) continue; //-------- ignores all files given in $ignored
        $files[$file] = filemtime($dir . '/' . $file); //-- add to files list
    }
    arsort($files); //------------------------------------- sort file values (creation timestamps)
    $files = array_keys($files); //------------------------ get all files after sorting
    return ($files) ? $files : false;
}