3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump( array_merge( array('a' => 1), array('b' => 2), array('a' => 2, 'c' => 3)));
Output for 4.3.0 - 7.2.0
array(3) { ["a"]=> int(2) ["b"]=> int(2) ["c"]=> int(3) }