使用MicroKernelTrait创建你自己的微框架

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Routing\RouteCollectionBuilder;
 
// require Composer's autoloader / 把Composer的自动加载器包容进来
require __DIR__.'/vendor/autoload.php';
 
class AppKernel extends Kernel
{
    use MicroKernelTrait;
 
    public function registerBundles()
    {
        return array(
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle()
        );
    }
 
    protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader)
    {
        // PHP equivalent of config.yml / 相当于config.yml的PHP
        $c->loadFromExtension('framework', array(
            'secret' => 'S0ME_SECRET'
        ));
    }
 
    protected function configureRoutes(RouteCollectionBuilder $routes)
    {
        // kernel is a service that points to this class
        // optional 3rd argument is the route name
        // kernel是一个指向这个类的服务。可选的第三个参数是路由名称
        $routes->add('/random/{limit}', 'kernel:randomAction');
    }
 
    public function randomAction($limit)
    {
        return new JsonResponse(array(
            'number' => rand(0, $limit)
        ));
    }
}
 
$kernel = new AppKernel('dev', true);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

{
    "require": {
        "...": "..."
    },
    "autoload": {
        "psr-4": {
            "": "src/"
        }
    }
}

// app/AppKernel.php
 
use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel;
use Symfony\Component\Routing\RouteCollectionBuilder;
use Doctrine\Common\Annotations\AnnotationRegistry;
 
// require Composer's autoloader
$loader = require __DIR__.'/../vendor/autoload.php';
// auto-load annotations
AnnotationRegistry::registerLoader(array($loader, 'loadClass'));
 
class AppKernel extends Kernel
{
    use MicroKernelTrait;
 
    public function registerBundles()
    {
        $bundles = array(
            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
            new Symfony\Bundle\TwigBundle\TwigBundle(),
            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle()
        );
 
        if ($this->getEnvironment() == 'dev') {
            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
        }
 
        return $bundles;
    }
 
    protected function configureContainer(ContainerBuilder $c, LoaderInterface $loader)
    {
        $loader->load(__DIR__.'/config/config.yml');
 
        // configure WebProfilerBundle only if the bundle is enabled
        // 配置WebProfilerBundle，只当此bundle被开启时
        if (isset($this->bundles['WebProfilerBundle'])) {
            $c->loadFromExtension('web_profiler', array(
                'toolbar' => true,
                'intercept_redirects' => false,
            ));
        }
    }
 
    protected function configureRoutes(RouteCollectionBuilder $routes)
    {
        // import the WebProfilerRoutes, only if the bundle is enabled
        // 导入WebProfilerRoutes，只当此bundle被开启时
        if (isset($this->bundles['WebProfilerBundle'])) {
            $routes->import('@WebProfilerBundle/Resources/config/routing/wdt.xml', '/_wdt');
            $routes->import('@WebProfilerBundle/Resources/config/routing/profiler.xml', '/_profiler');
        }
 
        // load the annotation routes / 加载annotation路由
        $routes->import(__DIR__.'/../src/App/Controller/', '/', 'annotation');
    }
 
    // optional, to use the standard Symfony cache directory
    // 可选，使用标准的Symfony缓存目录
    public function getCacheDir()
    {
        return __DIR__.'/../var/cache/'.$this->getEnvironment();
    }
 
    // optional, to use the standard Symfony logs directory
    // 可选，使用标准的Symfony日志目录
    public function getLogDir()
    {
        return __DIR__.'/../var/logs';
    }
}

/ src/App/Controller/MicroController.php
namespace App\Controller;
 
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
class MicroController extends Controller
{
    /**
     * @Route("/random/{limit}")
     */
    public function randomAction($limit)
    {
        $number = rand(0, $limit);
 
        return $this->render('micro/random.html.twig', array(
            'number' => $number
        ));
    }
}

// web/index.php
 
use Symfony\Component\HttpFoundation\Request;
 
require __DIR__.'/../app/AppKernel.php';
 
$kernel = new AppKernel('dev', true);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);

your-project/
├─ app/
|  ├─ AppKernel.php
│  ├─ config/
│  └─ Resources
|     └─ views
|        ├─ base.html.twig
|        └─ micro
|           └─ random.html.twig
├─ src/
│  └─ App
|     └─ Controller
|        └─ MicroController.php
├─ var/
|  ├─ cache/
│  └─ logs/
├─ vendor/
│  └─ ...
├─ web/
|  └─ index.php
├─ composer.json
└─ composer.lock