edit php adding sort function to the code

id like the following code to work, the sort function doesnt work. <?php if ($handle = opendir('uploads')) { while (false !== ($file = readdir($handle))) { if ($file != "." && $file != ".."){ sort ($file); $thelist .= '<li><a href="uploads/'.$file.'" target="_top">'.$file.'</a><img src="uploads/'.$file.$media.'" width="25" height="25"</li>'; } } closedir($handle); } ?> <ul><?php echo $thelist; ?></ul>