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<?php $a = ['a' => ['1','2']]; $b = ['a' => ['3','4']]; var_dump(array_merge_recursive($a, $b)['a']); var_dump(($a + $b)['a']);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" } array(2) { [0]=> string(1) "1" [1]=> string(1) "2" }

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