3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $seq = [1, 2, 2, 3, 3, 3]; $test = array_reduce($seq, function($carry, $value) { return $carry ^ $value; }); var_dump($test);
based on mJkO1
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
int(2)