使用Symfony組件構建自己的PHP框架

>本教程展示了使用Symfony組件構建最小的PHP框架。 雖然並不詳盡，但它涵蓋了功能應用的核心元素。 有關更深入的潛水，請諮詢官方的Symfony文檔。

密鑰概念：

>本教程利用符號組件來構建靈活的框架。 它使用HTTPFOUNDATION來管理HTTP請求和響應，以取代標準PHP Globals。 該路由組件可以啟用動態URL處理，並且EventDisPatcher組件通過觀察者模式促進了模塊化和可擴展性。 最後，httpkernel組件簡化了請求處理和響應生成。

項目設置：

的文件開頭，然後使用Composer安裝必要的組件：index.php

php composer.phar require symfony/http-foundation symfony/http-kernel symfony/routing symfony/event-dispatcher

httpfoundation： > HTTPFOUNDATION提供

類。 最初，Request可能看起來像這樣（使用Globals）：> Response index.php通過使用HTTPFOUNDATION：

switch($_SERVER['PATH_INFO']) {
    case '/': echo 'Home'; break;
    case '/about': echo 'About'; break;
    default: echo 'Not Found!';
}

httpkernel：要封裝框架邏輯，創建A

require 'vendor/autoload.php';
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

$request = Request::createFromGlobals();
$response = new Response();

switch ($request->getPathInfo()) {
    case '/': $response->setContent('Home'); break;
    case '/about': $response->setContent('About'); break;
    default: $response->setContent('Not Found!')->setStatusCode(Response::HTTP_NOT_FOUND);
}

$response->send();

）：> > update

Core lib/Framework/Core.php

<?php
namespace Framework;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\HttpKernelInterface;

class Core implements HttpKernelInterface {
    public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true) {
        switch ($request->getPathInfo()) {
            case '/': return new Response('Home');
            case '/about': return new Response('About');
            default: return new Response('Not Found!', Response::HTTP_NOT_FOUND);
        }
    }
}

> index.php>使用路由組件的路由系統增強了

require 'lib/Framework/Core.php';
$request = Request::createFromGlobals();
$app = new Framework\Core();
$response = $app->handle($request);
$response->send();

<?php
// ... (previous code) ...
use Symfony\Component\Routing\Matcher\UrlMatcher;
use Symfony\Component\Routing\RequestContext;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;

class Core implements HttpKernelInterface {
    protected $routes;

    public function __construct() { $this->routes = new RouteCollection(); }

    public function handle(Request $request) {
        $context = new RequestContext();
        $context->fromRequest($request);
        $matcher = new UrlMatcher($this->routes, $context);

        try {
            $attributes = $matcher->match($request->getPathInfo());
            $controller = $attributes['controller'];
            unset($attributes['controller']);
            return call_user_func_array($controller, $attributes);
        } catch (ResourceNotFoundException $e) {
            return new Response('Not Found!', Response::HTTP_NOT_FOUND);
        }
    }

    public function map($path, $controller) {
        $this->routes->add($path, new Route($path, ['controller' => $controller]));
    }
}

$app->map('/', function() { return new Response('Home'); });
$app->map('/about', function() { return new Response('About'); });
// ...