3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = function(int $a = null) {echo $a . '!';}; $a(3); $a(null);
based on 8a06L
Output for 7.0.0 - 7.2.0
3!!
Output for 5.3.22 - 5.6.28
Catchable fatal error: Argument 1 passed to {closure}() must be an instance of int, integer given, called in /in/Zo5Z0 on line 5 and defined in /in/Zo5Z0 on line 3
Process exited with code 255.