3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = null; $y = array_merge(array('a'=>2, 'b'=>4, 'c'=>6), $x); var_dump($y);
Output for 5.0.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_merge(): Argument #2 is not an array in /in/aAUGW on line 3 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Invalid operand type was used: expects array(s) in /in/aAUGW on line 3 NULL
Output for 4.3.0 - 4.4.9
array(3) { ["a"]=> int(2) ["b"]=> int(4) ["c"]=> int(6) }