如何在CodeIgniter中使用curl获取json数据

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Curl_example extends CI_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->helper('url');
    }

    public function get_json_data() {
        $url = 'https://api.example.com/data'; // 替换为实际的API URL

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        if ($httpCode != 200) {
            echo 'Error: ' . curl_error($ch);
        } else {
            $data = json_decode($response, true);
            print_r($data);
        }

        curl_close($ch);
    }
}