3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = [1,2,3,4,5,6,7,8,9]; array_walk_recursive($a, function ($value, $key) {$value+=1;}); echo $a;
based on 9X9nN
Output for 5.6.0 - 7.3.0alpha1
Notice: Array to string conversion in /in/79aa8 on line 5 Array