3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $contains = ['a', 'b', 'c']; $check = ['b', 'd']; $missing = array_diff($check, $contains); var_dump(count($missing) !== count($check));
based on eJpNN
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.8
bool(true)