3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
(<?php function hu ($a, $b=null) { if(!isset($b)) var_dump($b); } hu ( 1 );
based on L7qMm
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
(NULL