3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(0,1,2,'foo' => 'bar'); $b = array(3,4,5,'foo' => 'quux'); $a += $b; var_dump($a); var_dump($b);
based on f8bm6
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> int(0) [1]=> int(1) [2]=> int(2) ["foo"]=> string(3) "bar" } array(4) { [0]=> int(3) [1]=> int(4) [2]=> int(5) ["foo"]=> string(4) "quux" }