如何在嵌套对象数组PHP中获取键的值

function getValueByKey($array, $key) {
    foreach ($array as $item) {
        if (is_array($item)) {
            $value = getValueByKey($item, $key);
            if ($value !== null) {
                return $value;
            }
        } elseif (isset($item[$key])) {
            return $item[$key];
        }
    }
    return null;
}

// 示例数据
$data = [
    [
        'name' => 'John',
        'age' => 25,
        'address' => [
            'street' => '123 Main St',
            'city' => 'New York'
        ]
    ],
    [
        'name' => 'Jane',
        'age' => 30,
        'address' => [
            'street' => '456 Elm St',
            'city' => 'Los Angeles'
        ]
    ]
];

// 获取键为'city'的值
$city = getValueByKey($data, 'city');
echo $city; // 输出：New York