// index.php
if (isset($_GET['action'])) {
    $action = $_GET['action'];
    
    switch ($action) {
        case 'getUser':
            getUser();
            break;
        case 'saveData':
            saveData();
            break;
        default:
            echo "未知操作";
    }
}

function getUser() {
    echo json_encode(['id' => 1, 'name' => '张三']);
}

function saveData() {
    // 保存数据逻辑
    echo "数据保存成功";
}

// .htaccess (Apache)
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

// index.php
$request = $_GET['url'] ?? '';
$parts = explode('/', $request);

$controller = $parts[0] ?? 'home';
$method = $parts[1] ?? 'index';
$params = array_slice($parts, 2);

if (function_exists($method)) {
    call_user_func_array($method, $params);
} else {
    http_response_code(404);
    echo "方法不存在";
}

// api.php
$function = $_GET['func'] ?? '';
$allowedFunctions = ['getUser', 'saveData'];

if (in_array($function, $allowedFunctions) && function_exists($function)) {
    call_user_func($function);
} else {
    http_response_code(403);
    echo "不允许的操作";
}