3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php error_reporting(-1); echo r;
Output for 7.2.0
Warning: Use of undefined constant r - assumed 'r' (this will throw an Error in a future version of PHP) in /in/CmDRi on line 4 r
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant r - assumed 'r' in /in/CmDRi on line 4 r