How to compare array and return missing elements?

Question

PHP

This is how I reveal new elements in the array:

$r = array_diff_assoc($followers_new, $followers_old);

$r contains elements that are not in $followers_old.
Now the question is how to carry out a comparison so that it would return only those elements that were in $followers_old, but they are not in $followers_new.

Answer 1

Need to swap arrays

$r = array_diff_assoc($followers_old, $followers_new);