3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a($x=A) { } a(); define('A', 1);
Output for 7.2.0
Warning: Use of undefined constant A - assumed 'A' (this will throw an Error in a future version of PHP) in /in/vUhHn on line 3
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant A - assumed 'A' in /in/vUhHn on line 3