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<?php $arr1 = array('bundle1', 'bundle2'); $arr2 = array('bundle2', 'bundle1'); var_dump(array_merge($arr1, $arr2)); var_dump($arr1 + $arr2);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(7) "bundle1" [1]=> string(7) "bundle2" [2]=> string(7) "bundle2" [3]=> string(7) "bundle1" } array(2) { [0]=> string(7) "bundle1" [1]=> string(7) "bundle2" }