3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function x( $a=FOO ) {} x();
based on IWUiI
Output for 7.2.0
Warning: Use of undefined constant FOO - assumed 'FOO' (this will throw an Error in a future version of PHP) in /in/GUqXW on line 2
Output for 5.3.22 - 7.1.10
Notice: Use of undefined constant FOO - assumed 'FOO' in /in/GUqXW on line 2