Как соединить два многомерных массива в php?

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$array1 = array(
    "fruit" => array(
        "apple",
        "banana"
    ),
    "vegetable" => array(
        "carrot"
    )
);

$array2 = array(
    "fruit" => array(
        "orange"
    ),
    "vegetable" => array(
        "lettuce",
        "spinach"
    )
);

$result = array_merge_recursive($array1, $array2);

print_r($result);

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Array
(
    [fruit] => Array
        (
            [0] => apple
            [1] => banana
            [2] => orange
        )

    [vegetable] => Array
        (
            [0] => carrot
            [1] => lettuce
            [2] => spinach
        )

)