3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(array_merge(array(1,2), null));
based on cUcFt
Output for 5.0.0 - 7.2.0
Warning: array_merge(): Argument #2 is not an array in /in/6fidt on line 3 NULL
Output for 4.3.0 - 4.4.9
array(2) { [0]=> int(1) [1]=> int(2) }