使用 MicroKernelTrait 构建您自己的框架

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// ...
use App\Exception\Danger;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class Kernel extends BaseKernel implements EventSubscriberInterface
{
    use MicroKernelTrait;

    // ...

    public function onKernelException(ExceptionEvent $event): void
    {
        if ($event->getThrowable() instanceof Danger) {
            $event->setResponse(new Response('It\'s dangerous to go alone. Take this ⚔'));
        }
    }

    public static function getSubscribedEvents(): array
    {
        return [
            KernelEvents::EXCEPTION => 'onKernelException',
        ];
    }
}

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// src/Kernel.php
namespace App;

use App\DependencyInjection\AppExtension;
use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Bundle\TwigBundle\TwigBundle;
use Symfony\Bundle\WebProfilerBundle\WebProfilerBundle;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    public function registerBundles(): iterable
    {
        yield FrameworkBundle();
        yield TwigBundle();

        if ('dev' === $this->getEnvironment()) {
            yield WebProfilerBundle();
        }
    }

    protected function build(ContainerBuilder $containerBuilder): void
    {
        $containerBuilder->registerExtension(new AppExtension());
    }

    protected function configureContainer(ContainerConfigurator $container): void
    {
        $container->import(__DIR__.'/../config/framework.yaml');

        // register all classes in /src/ as service
        $container->services()
            ->load('App\\', __DIR__.'/*')
            ->autowire()
            ->autoconfigure()
        ;

        // configure WebProfilerBundle only if the bundle is enabled
        if (isset($this->bundles['WebProfilerBundle'])) {
            $container->extension('web_profiler', [
                'toolbar' => true,
                'intercept_redirects' => false,
            ]);
        }
    }

    protected function configureRoutes(RoutingConfigurator $routes): void
    {
        // import the WebProfilerRoutes, only if the bundle is enabled
        if (isset($this->bundles['WebProfilerBundle'])) {
            $routes->import('@WebProfilerBundle/Resources/config/routing/wdt.xml')->prefix('/_wdt');
            $routes->import('@WebProfilerBundle/Resources/config/routing/profiler.xml')->prefix('/_profiler');
        }

        // load the routes defined as PHP attributes
        // (use 'annotation' as the second argument if you define routes as annotations)
        $routes->import(__DIR__.'/Controller/', 'attribute');
    }

    // optional, to use the standard Symfony cache directory
    public function getCacheDir(): string
    {
        return __DIR__.'/../var/cache/'.$this->getEnvironment();
    }

    // optional, to use the standard Symfony logs directory
    public function getLogDir(): string
    {
        return __DIR__.'/../var/log';
    }
}

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// src/DependencyInjection/AppExtension.php
namespace App\DependencyInjection;

use Symfony\Component\Config\Definition\Configurator\DefinitionConfigurator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Extension\AbstractExtension;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

class AppExtension extends AbstractExtension
{
    public function configure(DefinitionConfigurator $definition): void
    {
        $definition->rootNode()
            ->children()
                ->booleanNode('foo')->defaultTrue()->end()
            ->end();
    }

    public function loadExtension(array $config, ContainerConfigurator $containerConfigurator, ContainerBuilder $containerBuilder): void
    {
        if ($config['foo']) {
            $containerBuilder->register('foo_service', \stdClass::class);
        }
    }
}

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

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class MicroController extends AbstractController
{
    #[Route('/random/{limit}')]
    public function randomNumber(int $limit): Response
    {
        $number = random_int(0, $limit);

        return $this->render('micro/random.html.twig', [
            'number' => $number,
        ]);
    }
}

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// public/index.php
use App\Kernel;
use Symfony\Component\HttpFoundation\Request;

require __DIR__.'/../vendor/autoload.php';

$kernel = new Kernel('dev', true);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);