Vets and Experianced: Filesystem crawl and index help.

[PyroX]

OK below is this little filesystem crawler for use on Linux. This thing is fast, real fast, mainly because it is so low level at the moment. Now I am faced with a problem and I need some thoughts. What I want to end up with is a sorted multidimensional array where $array[] containts the root folders and files, and each level down contains the subs, for example:

/root
     app1/
             images/
                         image1.gif
             includes/
                         config.inc.php
     app2/
     app3/


$array['app1']['images'][0] would be image1.gif.
$array['app1']['includes'][0] would be config.gif.

Here is a rough idea INCOMPLETE EXAMPLE of what my class looks like:

class spider
{
       var $name;
       var $folders;
       var $files;

function spider($dir){
global $init;
global $count;

$rx = @opendir($dir);

$part = str_replace($init,'',realpath($dir));
$this->name=$part;
$depth = split('/',$part);
$depth = count($depth);

while($file = @readdir($rx)){

    if($file != '.' and $file!='..'){

                    #$buff = ftp_mdtm($ftp, $dir.'/'.$file);

                    if(is_dir($dir.'/'.$file)){
                            $this->folders[]=$file
                            $thi = new spider($dir.'/'.$file);
                            $thi = null;

                    } else {
                    $count++;
                     $this->files[] = $file;
                    }
    }
}
}
}
?>

Now the class does a great job of gathering the layout , my questions is pretty much can anyone help me improve / resolve my problem of getting the sorted multidimensional array of the layout?

I have soo much giong on I can't work this out.