如何在php中使用curl post请求运行graphql api

<?php
// GraphQL查询或变异
$query = '
  mutation {
    createUser(name: "John Doe", email: "john.doe@example.com") {
      id
      name
      email
    }
  }
';

// GraphQL API的URL
$url = 'https://your-graphql-api.com/graphql';

// 初始化cURL会话
$ch = curl_init();

// 设置cURL选项
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(['query' => $query]));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
  'Content-Type: application/json',
  // 如果API需要认证，添加相应的头部
  // 'Authorization: Bearer YOUR_TOKEN'
]);

// 执行cURL会话并获取响应内容
$response = curl_exec($ch);

// 检查是否有错误发生
if(curl_errno($ch)){
  echo 'cURL error: '. curl_error($ch);
}

// 关闭cURL会话
curl_close($ch);

// 解码响应JSON
$result = json_decode($response, true);

// 输出结果
print_r($result);
?>