3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo($a = "default", $b, $c) { echo $a; } foo(NULL,'1','2');
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
Output for hhvm-3.12.14

Process exited with code 137.