3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array(array(1,2,3,4)); $b = array(0); $c = array_merge($a, $b); echo var_dump($c);
based on QITnI
Output for 4.3.0 - 7.2.0
array(2) { [0]=> array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) } [1]=> int(0) }