PHP框架如何提高电商平台的性能和可扩展性？

use Symfony\Component\Cache\Simple\FilesystemCache;

$cache = new FilesystemCache();
$cachedValue = $cache->get('my_cached_value');

if (!$cachedValue) {
    // 执行业务逻辑并获取值
    $cachedValue = 'my_value';
    $cache->set('my_cached_value', $cachedValue, 3600);
}

$product = $entityManager->getRepository('Product')
    ->findOneBy(['name' => 'My Product']);

// 定义 UserRepository 接口
interface UserRepositoryInterface
{
    public function find($id);
    public function findAll();
}

// 创建 UserRepository 的实现
class UserRepository implements UserRepositoryInterface
{
    // 实现接口方法
}

// 在控制器中使用 UserRepository
class ProductController
{
    private $userRepository;

    public function __construct(UserRepositoryInterface $userRepository)
    {
        $this->userRepository = $userRepository;
    }

    public function index()
    {
        $products = $this->userRepository->findAll();
    }
}

class MyServiceProvider extends ServiceProvider
{
    public function boot()
    {
        // 注册新功能的路由、视图、模型等
    }
}