Get list of images in given directory

/*
Get list of images in given directory
*/

function get_image_list($dir)  {
    $files = array();
    $h = opendir($dir);
    while ( false !== ( $file = readdir($h) ) ) {
         // if file isn't this directory or its parent
        if ($file != '.'
            && $file != '..'
            && !is_dir($dir.'/'.$file)
            && preg_match('@(gif|png|jpg|jpeg)$@i', $file) ) {
                $files[] = $file;
        }
    }
    closedir($h);

    return $files;
}