3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php interface Foo { public function process($request, Foo $next); } class Bar implements Foo { public function process($request, Foo $next = null) { } } new Bar();
based on joRGD
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6