3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $str1 = 'meh'; $str2 = 'waff'; echo implode(array(array_keys(array_combine(array($str1), array($str2)))[0], array_combine(array($str1), array($str2))[array_keys(array_combine(array($str1), array($str2)))[0]]));
based on 0Xesh
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc3
mehwaff