如何将js嵌套对象转换为php数组

var jsObject = {
  name: "John",
  age: 25,
  address: {
    street: "123 Main St",
    city: "New York",
    country: "USA"
  }
};

var jsonString = JSON.stringify(jsObject);

$jsonString = '{"name":"John","age":25,"address":{"street":"123 Main St","city":"New York","country":"USA"}}';

$phpArray = json_decode($jsonString, true);

$name = $phpArray['name'];
$age = $phpArray['age'];
$street = $phpArray['address']['street'];
$city = $phpArray['address']['city'];
$country = $phpArray['address']['country'];