3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array( ); var_dump(array_reduce($array, function(int $carry, array $item) { return $carry + count($item); }, 0));
based on ZtBqe
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.8
int(0)