3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $foo = array('bar' => null); if (isset($foo['bar'])) { echo 'hello world'; } else { echo 'hello alien'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
hello alien