3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = foo;
Output for 7.2.0
Warning: Use of undefined constant foo - assumed 'foo' (this will throw an Error in a future version of PHP) in /in/5G2oX on line 3
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant foo - assumed 'foo' in /in/5G2oX on line 3