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<?php $a = array(1, 2, 3, 4, 5); $b = array(2,4,6); var_dump(array_diff($b, $a)); var_dump(array_diff($a, $b));
Output for 4.3.0 - 7.2.0
array(1) { [2]=> int(6) } array(3) { [0]=> int(1) [2]=> int(3) [4]=> int(5) }