3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo(string $value = null) { return $value; } var_dump(foo(null));
based on S7dNf
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.3.0alpha1
NULL