<?php

// ArticlesRespositoryInterface.php
interface ArticlesRepositoryInterface
{
    public function get($id): Article;
}

// PDOArticlesRespository.php
class PDOArticleRepository implements ArticlesRepositoryInterface
{
    public function get($id): Article
    {}
}

// FileSystemArticlesRespository.php
class FileSystemArticleRepository implements ArticlesRepositoryInterface
{
    public function get($id): Article
    {}
}

// GetArticlesController.php
class GetArticleController
{
    protected $articlesRepository:

    public function __construct(
        ArticlesRepositoryInterface $articlesRepository
    ) {
        $this->articlesRepository = $articlesRepository;
    }

    public function __invoke(
        Request $request,
        Response $response
    ) {
        $id = $request->input('id');

        $article = $articlesRepository->get($id);

        $response->getBody()->write("{$article->title}");

        return $response;
    }
}

// app.php
$container->bind(ArticleRepositoryInterface::class, function($container) {
    $connection = $container->get(Connection::class);

    return new FileSystemArticleRepository($connection);
});

$container->bind(GetArticleController::class, function ($container) {
    $repository = $container->get(ArticleRepositoryInterface::class);

    return new GetArticleController($repository):
});

$container->get(GetArticleController::class);

Route::get('/articles/', 'GetArticleController'):

// config/services.yml
services:
    Connection:
        arguments:
            database: mysql
            host: localhost
            user: ricardo
            pass: 123456

    ArticleRepositoryInterface:
        class: PDOArticleRepository
        arguments:
            - Connection

    GetArticleController:
        arguments:
            - ArticleRepositoryInterface