function listdir_by_date($path = "."){
        $dir = opendir($path);
        $list = array();
        while($file = readdir($dir)){
            if ($file != '.' and $file != '..' and $file != 'index.php' and $file != 'browse.php') {
                $ctime = filectime($data_path . $file) . ',' . $file;
                $list[$ctime] = $file;
            }
        }
        closedir($dir);
        krsort($list);
        return $list;
    }

    $list = listdir_by_date();

    foreach ($list as $key => $value) {
       echo "<a href='$value'><img style='width:200px;' src='$value' /></a>";
    }