3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = [1, 3, 6, 4, 1, 2]; $b = range(1, max($a)); var_dump(array_diff($b, $a));
based on 8bbtT
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
array(1) { [4]=> int(5) }