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run code in 150+ php & hhvm versions
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<?php var_dump(array_diff(array(1, 2, 4, 5)+array(1, 2), array_intersect(array(1, 2, 4, 5),array(1, 2))));
Output for 4.3.0 - 7.1.0
array(2) { [2]=> int(4) [3]=> int(5) }