3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function nest($v, $prefix = 'in-') { function f($v, $prefix) { return $prefix . $v; }; echo f($v, $prefix); } nest('down');
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
in-down
Output for hhvm-3.10.0

Process exited with code 153.