如何从cURL中提取json_decode数组元素值

$url = 'http://example.com/api'; // 替换为实际的API地址
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
curl_close($ch);

$data = json_decode($response, true);

{
  "name": "John",
  "age": 30,
  "email": "john@example.com"
}

$name = $data['name'];
$age = $data['age'];
$email = $data['email'];

{
  "name": "John",
  "age": 30,
  "email": "john@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  }
}

$street = $data['address']['street'];
$city = $data['address']['city'];
$country = $data['address']['country'];