3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function mycallback(&$result, $current) { $result[$current] = $current; } var_dump(array_reduce(range('a', 'z'), 'mycallback'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
NULL