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

Just to clarify as I was looking into this question the answers of @Jon and @Dallas Caley are both correct depending on the domain of your arrays.

If the array against what you are comparing is the full domain of your results then a simple array_diff will suffice as per @Jon answer.

If the array against what you are comparing is NOT the full domain of your results then you should go with the double array_diff as per @Dallas Caley answer.