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<?php $array1 = array('a', 'b', 'c', 'd', 'e'); $array2 = array('a', 'b'); var_dump(array_intersect($array1, $array2)); ?>
based on FHLpC
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(2) { [0]=> string(1) "a" [1]=> string(1) "b" }