3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function b($a = array('hello')) { var_dump($a); } b();
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(5) "hello" }
Output for hhvm-3.10.0

Process exited with code 153.