Creating hierarchal list based on categories table

I have the following category table:

Id     Name              parent_id
-----------------------------------
1      Bakery              NULL
3      Fresh Meats      NULL
4      Bread              1
5      Cake              1
6      Rolls              4
7      Loaves              4
8      Bagettes              4
9      Beef                      3
10      Lamb              3
11      Pork                      3
12    White               7
13    Brown              7

Whats the most efficient way to produce a hierarchal list in SQL/PHP like:

Bakery
> Bread
>> Baguettes
>> Loaves
>>> White
>>> Brown
>> Rolls
> Cake
Fresh Meats
> Beef
> Lamb
> Pork

Also whats the best way to get all the perent categories from the id. So for example if I knew an item was in category id 12 then to get the list:

Bakery
Bread
Loaves
White (this category)
alex_wareingAsked:
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gr8gonzoConsultantCommented:
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gr8gonzoConsultantCommented:
I found a good script for this a while back - I will try to find it and get back to you.
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