3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php declare(strict_types=1); function foo(string $bar = null) { var_dump($bar); } foo(null);
based on n99Qv
Output for 7.0.0 - 7.2.0
NULL
Output for 5.3.21 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/e5vIc on line 1 NULL