[PHP] sorting multi-dimensional arrays

[Shane43]

I have a question about sorting multidimensional arrays. Here is my problem:

I have an 2-d array:
$joke[1][rating]=10;
$joke[2][rating]=20;
$joke[3][rating]=15;
....

I would like to sort the jokes into an array based on the rating from highest 
to lowest. The end result would be something like this:
Joke 2 : 20 points
Joke 3: 15 points
Joke 1: 10 points

How do I accomplish this?

I have tried fooling around with sort(), arsort(), and array_multisort(), but 
I just can't get it. Thank you very much for your time.

Shane