How to create a directory/folder when I create a category?

[eluser]rogierb[/eluser]
I created a helper function create_path() for creating folders.
Since I use this a lot and mostly on several directories (/www/some_dir/another_dir/final_destination) it is recursive (wel kind of anyway...)

Code:

function create_path($folder)
    {
        // create dir if not exists
        $folder = explode( "/" , $folder );
        $mkfolder = "";
        //sets the complete directory path
        for(  $i=0 ; isset( $folder[$i] ) ; $i++ )
        {
            $mkfolder .= $folder[$i] . '/';
            if(!is_dir($mkfolder )) mkdir("$mkfolder");
        }
    }