phpcmsAPI怎么开发？接口功能如何编写调用？

class Api extends pc_base {
    private $db;

    public function __construct() {
        parent::__construct();
        $this->db = pc_base::load_model('content_model'); // 加载模型
    }

    // 示例：获取文章列表
    public function lists() {
        $catid = intval($_GET['catid']);
        $page = max(1, intval($_GET['page']));
        $pagesize = 10;

        $this->db->set_catid($catid);
        $data = $this->db->listinfo('', 'id DESC', $page, $pagesize);

        header('Content-Type: application/json');
        echo json_encode(['status' => 1, 'data' => $data, 'page' => $page]);
        exit;
    }

    // 示例：获取单篇文章
    public function show() {
        $id = intval($_GET['id']);
        if (!$id) {
            echo json_encode(['status' => 0, 'msg' => '参数错误']);
            exit;
        }

        $this->db = pc_base::load_model('content_model');
        $data = $this->db->get_content($id);
        
        header('Content-Type: application/json');
        echo json_encode(['status' => 1, 'data' => $data]);
        exit;
    }
}

$token = $_GET['token'];
if ($token !== 'your_secure_token') {
    echo json_encode(['status' => 0, 'msg' => '无权访问']);
    exit;
}

fetch('/index.php?m=api&c=Api&a=lists&catid=11')
  .then(res => res.json())
  .then(data => {
    console.log(data.data);
  });

$.get('index.php?m=api&c=Api&a=lists', {catid: 11}, function(res) {
    if (res.status === 1) {
        console.log(res.data);
    }
});