理解与解决：.htaccess环境变量在非Apache环境下的PHP访问问题

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.cg\.mywebsite(\.com)?(\:[0-9]+)?$
RewriteRule (.*) $1 [E=COUNTRY:57]

// src/Service/CountryResolver.php
namespace App\Service;

use Symfony\Component\HttpFoundation\RequestStack;

class CountryResolver
{
    private RequestStack $requestStack;
    private ?int $country = null;

    public function __construct(RequestStack $requestStack)
    {
        $this->requestStack = $requestStack;
    }

    public function getCountry(): int
    {
        if (null !== $this->country) {
            return $this->country;
        }

        $request = $this->requestStack->getCurrentRequest();
        if (!$request) {
            // 如果没有当前请求，返回默认值
            return 1;
        }

        $host = $request->getHost();

        // 模拟 .htaccess 的 RewriteCond 逻辑
        if (preg_match('/^www\.cg\.mywebsite(\.com)?(\:[0-9]+)?$/', $host)) {
            $this->country = 57;
        } else {
            $this->country = 1; // 默认值
        }

        return $this->country;
    }
}

// src/Controller/MyController.php
namespace App\Controller;

use App\Service\CountryResolver;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class MyController extends AbstractController
{
    private CountryResolver $countryResolver;

    public function __construct(CountryResolver $countryResolver)
    {
        $this->countryResolver = $countryResolver;
    }

    #[Route('/some-path', name: 'app_some_path')]
    public function someAction(): Response
    {
        $country = $this->countryResolver->getCountry();
        // 使用 $country 进行业务逻辑
        return new Response('Country is: ' . $country);
    }
}

// src/EventListener/CountryParameterListener.php
namespace App\EventListener;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class CountryParameterListener implements EventSubscriberInterface
{
    private array $params;

    public function __construct(array $params = [])
    {
        $this->params = $params;
    }

    public function onKernelRequest(RequestEvent $event)
    {
        if (!$event->isMainRequest()) {
            return;
        }

        $request = $event->getRequest();
        $host = $request->getHost();
        $country = 1; // 默认值

        if (preg_match('/^www\.cg\.mywebsite(\.com)?(\:[0-9]+)?$/', $host)) {
            $country = 57;
        }

        // 将国家代码设置为请求属性，以便在控制器或服务中获取
        $request->attributes->set('app_country', $country);

        // 如果需要，也可以将其设置为环境变量或容器参数，但请求属性更直接
        // 或者，在 config/services.yaml 中定义一个参数，并在构造函数中注入
        // 然后在这里更新该参数，但这通常需要更复杂的逻辑或重新编译容器
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::REQUEST => ['onKernelRequest', 10], // 优先级较高，确保早期执行
        ];
    }
}