PHP将一个多维数组的子数组合并到另一个内联数组中

$array1 = array(
    "fruit" => array("apple", "banana"),
    "color" => array("red", "green")
);

$array2 = array(
    "fruit" => array("orange"),
    "color" => array("blue")
);

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

print_r($result);

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

    [color] => Array
        (
            [0] => red
            [1] => green
            [2] => blue
        )

)