94 lines
2.6 KiB
Markdown
94 lines
2.6 KiB
Markdown
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HttpKernel Component
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====================
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The HttpKernel component provides the dynamic part of the HTTP specification.
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It provides the HttpKernelInterface, which is the core interface of the Symfony2
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full-stack framework:
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```
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interface HttpKernelInterface
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{
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/**
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* Handles a Request to convert it to a Response.
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*
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* @param Request $request A Request instance
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*
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* @return Response A Response instance
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*/
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function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true);
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}
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```
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It takes a Request as an input and should return a Response as an output. Using this
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interface makes your code compatible with all frameworks using the Symfony2 components.
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And this will gives you many cool features for free.
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Creating a framework based on the Symfony2 components is really easy. Here is a very
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simple, but fully-featured framework based on the Symfony2 components:
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```
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$routes = new RouteCollection();
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$routes->add('hello', new Route('/hello', array('_controller' =>
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function (Request $request) {
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return new Response(sprintf("Hello %s", $request->get('name')));
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}
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)));
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$request = Request::createFromGlobals();
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$context = new RequestContext();
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$context->fromRequest($request);
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$matcher = new UrlMatcher($routes, $context);
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$dispatcher = new EventDispatcher();
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$dispatcher->addSubscriber(new RouterListener($matcher));
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$resolver = new ControllerResolver();
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$kernel = new HttpKernel($dispatcher, $resolver);
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$kernel->handle($request)->send();
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```
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This is all you need to create a flexible framework with the Symfony2 components.
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Want to add an HTTP reverse proxy and benefit from HTTP caching and Edge Side Includes?
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```
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$kernel = new HttpKernel($dispatcher, $resolver);
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$kernel = new HttpCache($kernel, new Store(__DIR__.'/cache'));
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```
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Want to functional test this small framework?
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```
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$client = new Client($kernel);
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$crawler = $client->request('GET', '/hello/Fabien');
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$this->assertEquals('Fabien', $crawler->filter('p > span')->text());
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```
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Want nice error pages instead of ugly PHP exceptions?
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```
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$dispatcher->addSubscriber(new ExceptionListener(function (Request $request) {
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$msg = 'Something went wrong! ('.$request->get('exception')->getMessage().')';
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return new Response($msg, 500);
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}));
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```
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I can continue on and on but I think you get the point.
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And that's why the simple looking HttpKernelInterface is so powerful.
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It gives you access to a lot of cool features, ready to be used out of the box, with no efforts.
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Resources
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---------
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Unit tests:
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https://github.com/symfony/symfony/tree/master/tests/Symfony/Tests/Component/HttpKernel
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