Comments:

• Default result.
• start:

You can change the start changing the number of first element
• start = 1: Portugal categorie on my database"; ?>
• start = 0: All categorie on my database"; ?>
• max_rec:

Limit of number of recursion (default = 5)
• max_rec = 2: 2 level of recursion"; ?>
• without parameter max_rec : default value"; ?>
The source