PHP代码怎么实现RESTful API接口_PHP REST路由设计与实现

// index.php
$uri = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
$uri = explode('/', trim($uri, '/'));
$method = $_SERVER['REQUEST_METHOD'];

// 假设路径格式为 /api/users 或 /api/users/1
if ($uri[0] !== 'api') {
    http_response_code(404);
    echo json_encode(['error' => 'API endpoint not found']);
    exit;
}

$resource = $uri[1] ?? ''; // 资源名，如 users
$id = $uri[2] ?? null;     // ID（可选）

// 模拟数据存储
$users = [
    1 => ['id' => 1, 'name' => 'Alice', 'email' => 'alice@example.com'],
    2 => ['id' => 2, 'name' => 'Bob', 'email' => 'bob@example.com']
];

switch ($resource) {
    case 'users':
        switch ($method) {
            case 'GET':
                if ($id) {
                    if (isset($users[$id])) {
                        echo json_encode($users[$id]);
                    } else {
                        http_response_code(404);
                        echo json_encode(['error' => 'User not found']);
                    }
                } else {
                    echo json_encode(array_values($users));
                }
                break;

            case 'POST':
                $input = json_decode(file_get_contents('php://input'), true);
                $newId = max(array_keys($users)) + 1;
                $users[$newId] = [
                    'id' => $newId,
                    'name' => $input['name'],
                    'email' => $input['email']
                ];
                http_response_code(201);
                echo json_encode($users[$newId]);
                break;

            case 'PUT':
                if (!$id || !isset($users[$id])) {
                    http_response_code(404);
                    echo json_encode(['error' => 'User not found']);
                    break;
                }
                $input = json_decode(file_get_contents('php://input'), true);
                $users[$id]['name'] = $input['name'] ?? $users[$id]['name'];
                $users[$id]['email'] = $input['email'] ?? $users[$id]['email'];
                echo json_encode($users[$id]);
                break;

            case 'DELETE':
                if (!$id || !isset($users[$id])) {
                    http_response_code(404);
                    echo json_encode(['error' => 'User not found']);
                    break;
                }
                unset($users[$id]);
                http_response_code(204);
                break;

            default:
                http_response_code(405);
                echo json_encode(['error' => 'Method not allowed']);
        }
        break;

    default:
        http_response_code(404);
        echo json_encode(['error' => 'Resource not found']);
}

header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *'); // 支持跨域（开发阶段）
header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, PATCH');
header('Access-Control-Allow-Headers: Content-Type');