PHP怎么写接口_如何用PHP实现跨域请求的接口开发

<?php
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *'); // 允许所有域名跨域

// 接收参数
$param1 = $_GET['param1'] ?? '';
$param2 = $_POST['param2'] ?? '';

// 处理逻辑 (这里只是个例子)
$data = ['message' => 'Hello, world!', 'param1' => $param1, 'param2' => $param2];

// 返回 JSON
echo json_encode($data);
?>

<?php
require_once 'vendor/autoload.php'; // 假设你用了 composer

use Firebase\JWT\JWT;

$key = "your_secret_key"; // 密钥，务必保密
$payload = array(
    "iss" => "http://example.org",
    "aud" => "http://example.com",
    "iat" => time(),
    "nbf" => time() + 10,
    "user_id" => 123
);

$jwt = JWT::encode($payload, $key, 'HS256');

// 验证 JWT
try {
    $decoded = JWT::decode($jwt, $key, array('HS256'));
    print_r($decoded);
} catch (\Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}
?>

<?php
try {
    // 可能会出错的代码
    $result = some_function();
    if ($result === false) {
        throw new Exception('Some function failed');
    }
    echo json_encode(['status' => 'success', 'data' => $result]);

} catch (Exception $e) {
    // 捕获异常
    http_response_code(500); // 设置 HTTP 状态码
    echo json_encode(['status' => 'error', 'message' => $e->getMessage()]);
}
?>

<?php
// 开启 Gzip 压缩
if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) {
    ob_start("ob_gzhandler");
} else {
    ob_start();
}

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');

$data = ['message' => 'Hello, world!'];
echo json_encode($data);

ob_end_flush();
?>

<?php
// 简单的 RESTful 接口示例

$method = $_SERVER['REQUEST_METHOD'];
$resource = $_GET['resource'] ?? '';
$id = $_GET['id'] ?? '';

header('Content-Type: application/json');

switch ($resource) {
    case 'users':
        switch ($method) {
            case 'GET':
                if ($id) {
                    // 获取指定用户
                    $user = getUser($id);
                    echo json_encode($user);
                } else {
                    // 获取所有用户
                    $users = getAllUsers();
                    echo json_encode($users);
                }
                break;
            case 'POST':
                // 创建用户
                $data = json_decode(file_get_contents('php://input'), true);
                $newUser = createUser($data);
                echo json_encode($newUser);
                break;
            case 'PUT':
                // 更新用户
                $data = json_decode(file_get_contents('php://input'), true);
                $updatedUser = updateUser($id, $data);
                echo json_encode($updatedUser);
                break;
            case 'DELETE':
                // 删除用户
                deleteUser($id);
                echo json_encode(['message' => 'User deleted']);
                break;
            default:
                http_response_code(405); // Method Not Allowed
                echo json_encode(['message' => 'Method Not Allowed']);
        }
        break;
    default:
        http_response_code(404); // Not Found
        echo json_encode(['message' => 'Resource Not Found']);
}

// 示例函数 (需要自己实现)
function getUser($id) { return ['id' => $id, 'name' => 'Example User']; }
function getAllUsers() { return [['id' => 1, 'name' => 'User 1'], ['id' => 2, 'name' => 'User 2']]; }
function createUser($data) { return ['id' => 3, 'name' => $data['name']]; }
function updateUser($id, $data) { return ['id' => $id, 'name' => $data['name']]; }
function deleteUser($id) { /* 删除用户的逻辑 */ }
?>

openapi: 3.0.0
info:
  title: User API
  version: 1.0.0
paths:
  /users:
    get:
      summary: Get all users
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
                  properties:
                    id:
                      type: integer
                      description: User ID
                    name:
                      type: string
                      description: User Name