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I want to sort the array descendingly by the values in $array['b'] but I want all the other values to sorted along with those.
I understand that my description isn't very good and please let me know if you don't understand.
Not to worry regarding this, MySQL was able to do the sorting. Please go ahead an answer if you know anyway as I'm interested to know how this would be solved without MySQL.
I thought there was an example on that page that showed how to break a 3D down to 2D as you run the 2D through this function. I could be wrong. I used a modified hack of that function a while back to wrangle 2d and 3d arrays on multiple fields (like sorting within a sort). But I could be just plain wrong.