TalkPHP - Determine if this folder is the last level within that folder?

Good day,
I'm working on a script and this script list folder in a html list.

Here is the code;

PHP Code:


		
			

<html>

<head>

<style type="text/css">

ul {

      list-style-image: url(Icons/box_icon.png);



}



li li {

      list-style-image: url('Icons/open_book_icon.jpg');



}



li li li {

      list-style-image: url('Icons/gallery.gif');

}



</style>

</head>

<body>







<?PHP

function globDir($dir)

{

   $files = glob("$dir/*", GLOB_ONLYDIR);

   

     if(!empty($files))

   {

      echo "<ul>\n";



      foreach($files as $file)

      {

      echo "<li>";

 



      echo "<b>". basename($file)."</b>\n";



               globDir($file);

         echo "</li>\n";

      }

      echo "</ul>\n";

   }

}

globDir('Photos');

?>



</body>

</html>

example folder
|
- Folder 1
- Folder 2
|
- Folder2.1
|
- Folder3

The deal here is that I could go by CSS level of list but my problem is that sometime there is more subfolder yhat this example.

Is there a way that I can tell the last level folder to be written in bold ?

Thanks !