Opposite of array_intersect?

Question

Is there a built-in function to get all members of array 1 which do not exist in array 2?
I know how to do it programatically, only wondering if there is a built-in function

Answer 1

I found this docstore.mik.ua/orelly/webprog/pcook/ch04_24.htm quite useful.

You might want a reverse diff, by reversing the order of the arrays in a standard diff.