3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(array_merge_recursive(array('a'=>'b'), array('a'=>'c')));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["a"]=> array(2) { [0]=> string(1) "b" [1]=> string(1) "c" } }