3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a1 = array(); $a2 = null; array_merge($a1, $a2);
Output for 5.0.0 - 7.1.0
Warning: array_merge(): Argument #2 is not an array in /in/80SNT on line 5
Output for 4.3.0 - 4.4.9