3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo foo === "boo";
based on AKFJc
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/BUFVE on line 3
Output for 5.3.21 - 7.1.10
Notice: Use of undefined constant foo - assumed 'foo' in /in/BUFVE on line 3