3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $langs = array('en' => 'english', 'de' => 'german'); reset($langs); echo key($langs);
based on vjceN
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
en