如何在PHP的多维数组中追加一个新的key和value字段？

function appendKeyValue(&$array, $key, $value) {
    array_walk_recursive($array, function (&$item, $k) use ($key, $value) {
        if ($k === $key) {
            $item = $value;
        }
    });
}

// 示例多维数组
$myArray = array(
    'name' => 'John',
    'age' => 30,
    'contacts' => array(
        'email' => 'john@example.com',
        'phone' => '1234567890'
    )
);

// 追加新的key和value字段
appendKeyValue($myArray, 'address', '123 Main St');

// 打印修改后的数组
print_r($myArray);

Array
(
    [name] => John
    [age] => 30
    [contacts] => Array
        (
            [email] => john@example.com
            [phone] => 1234567890
        )

    [address] => 123 Main St
)