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<?php var_dump(array_diff(array_merge(array(1, 2, 4), array(1, 2, 5)), array_intersect(array(1, 2, 4),array(1, 2, 5))));
Output for 4.3.0 - 7.2.0
array(2) { [2]=> int(4) [5]=> int(5) }