3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = []; $x += [1,2,3]; $x += [4,5,6]; var_dump($x);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0alpha1
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }