3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(array_merge_recursive( array('dupa' => array( 1,2,3 )), array('dupa' => null)));
Output for 5.2.6 - 5.6.28, 7.0.0 - 7.1.0
array(1) { ["dupa"]=> array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> NULL } }
Output for 4.3.0 - 5.2.5, hhvm-3.10.0 - 3.12.0
array(1) { ["dupa"]=> array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } }