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<?php $arr = ["one", "two"]; $newItem = "three"; var_dump($arr + [$newItem]);
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { [0]=> string(3) "one" [1]=> string(3) "two" }

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170.9 ms | 403 KiB | 168 Q