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<?php $arr = [2, 3]; $arr2 = [1, 5]; var_dump($arr + $arr2, array_merge($arr, $arr2));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> int(2) [1]=> int(3) } array(4) { [0]=> int(2) [1]=> int(3) [2]=> int(1) [3]=> int(5) }

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