3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo !!undefined;
Output for 7.2.0 - 7.3.0rc4
Warning: Use of undefined constant undefined - assumed 'undefined' (this will throw an Error in a future version of PHP) in /in/82Nca on line 2 1
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant undefined - assumed 'undefined' in /in/82Nca on line 2 1