3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php if (UNDEFINED_CONST == true) { echo 'True!!'; }
based on JbLE2
Output for 7.2.0
Warning: Use of undefined constant UNDEFINED_CONST - assumed 'UNDEFINED_CONST' (this will throw an Error in a future version of PHP) in /in/VdRq6 on line 3 True!!
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant UNDEFINED_CONST - assumed 'UNDEFINED_CONST' in /in/VdRq6 on line 3 True!!