3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $val = 'abcd'; echo eval('return $'.val.';');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant val - assumed 'val' in /in/G6Loo on line 3 abcd