我如何通过php中的cURL发布JSON对象

$data = array(
    'name' => 'John Doe',
    'age' => 30
);

$jsonData = json_encode($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/api'); // 设置请求的URL
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // 将返回的数据保存到变量中，而不是直接输出
curl_setopt($ch, CURLOPT_POST, true); // 使用POST请求方式
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData); // 设置POST数据
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json')); // 设置请求头，指定数据为JSON格式

$response = curl_exec($ch);

curl_close($ch);

$data = array(
    'name' => 'John Doe',
    'age' => 30
);

$jsonData = json_encode($data);

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/api');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));

$response = curl_exec($ch);

curl_close($ch);