3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo FOO;
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant FOO - assumed 'FOO' (this will throw an Error in a future version of PHP) in /in/NLFrJ on line 2 FOO
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant FOO - assumed 'FOO' in /in/NLFrJ on line 2 FOO