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run code in 200+ php & hhvm versions
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<?php $arr = ["one", "two"]; $newItem = "three"; var_dump(array_merge($arr + [$newItem]));
based on PCE5v
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0beta1
array(2) { [0]=> string(3) "one" [1]=> string(3) "two" }