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run code in 200+ php & hhvm versions
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<?php $arr1 = [1,2,3,4,5]; $arr2 = [2,3]; var_dump(array_intersect($arr1, $arr2));
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
array(2) { [1]=> int(2) [2]=> int(3) }