List Directory Contents

<?php
    function list_files($dir)
    {
        if(is_dir($dir))
        {
            if($handle = opendir($dir))
            {
                while(($file = readdir($handle)) !== false)
                {
                    if($file != "." && $file != ".." && $file != "Thumbs.db")
                    {
                        echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
                    }
                }
                closedir($handle);
            }
        }
    }
?>