值为空值的PHP array_merge_recursive函数

$array1 = ['a' => 'apple', 'b' => null, 'c' => ['x' => 1]];
$array2 = ['a' => 'apricot', 'b' => ['y' => 2], 'd' => 'date'];

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

print_r($result);

Array
(
    [a] => apricot
    [b] => Array
        (
            [y] => 2
        )

    [c] => Array
        (
            [x] => 1
        )

    [d] => date
)

function remove_null_values($array) {
    return array_filter($array, function($value) {
        return $value !== null;
    });
}

$array1 = remove_null_values(['a' => 'apple', 'b' => null, 'c' => ['x' => 1]]);
$array2 = remove_null_values(['a' => 'apricot', 'b' => ['y' => 2], 'd' => 'date']);

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

print_r($result);