Categories in a multidimensional array?

Hi,

I need to do some clever formatting on my categories which involves looping through each category and applying different styles.

Is there any way of retrieving the categories in a multidimensional array so that I can deal with categories & subcategories?

Ideally I need the same as what the following function returns but I don’t want it already formatted for me in a list, I just want it in an array:

wp_list_categories(‘hide_empty=0&hierarchical=1&echo=0’);

Any ideas anyone?

Thanks,
Oliver