使用Symfony组件构建自己的PHP框架

>本教程展示了使用Symfony组件构建最小的PHP框架。 虽然并不详尽，但它涵盖了功能应用的核心元素。 有关更深入的潜水，请咨询官方的Symfony文档。

密钥概念：

>本教程利用符号组件来构建灵活的框架。 它使用HTTPFOUNDATION来管理HTTP请求和响应，以取代标准PHP Globals。 该路由组件可以启用动态URL处理，并且EventDisPatcher组件通过观察者模式促进了模块化和可扩展性。 最后，httpkernel组件简化了请求处理和响应生成。

项目设置：

的文件开头，然后使用Composer安装必要的组件：index.php

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

httpfoundation： > HTTPFOUNDATION提供

类。 最初，Request可能看起来像这样（使用Globals）：> Response index.php通过使用HTTPFOUNDATION：

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

httpkernel：要封装框架逻辑，创建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>使用路由组件的路由系统增强了

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'); });
// ...