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run code in 200+ php & hhvm versions
Bugs & Features
<?php $array1 = range(1,12); $array2 = ['1','2','3','5','6','7','8','9','10','11','12']; var_dump(array_values(array_diff($array1, $array2)));
based on pHcUJ
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(1) { [0]=> int(4) }