index.php

<?php
use Aura\Router\RouterFactory;
use Zend\Expressive\AppFactory;
use Zend\Expressive\Router\Aura as AuraBridge;
use Zend\Diactoros\Response\JsonResponse;

require 'vendor/autoload.php';

$auraRouter = (new RouterFactory())->newInstance();
$router = new AuraBridge($auraRouter);
$app = AppFactory::create(null, $router);

$beers = array(
    'brands' => array('Heineken', 'Guinness', 'Skol', 'Colorado'),
    'styles' => array('Pilsen' , 'Stout')
);

$app->get('/', function ($request, $response, $next) {
    $response->getBody()->write('Hello, beers of world!');
    return $response;
});

$app->get('/brand', function ($request, $response, $next) use ($beers) {
	return new JsonResponse($beers['brands']);
});

$app->get('/style', function ($request, $response, $next) use ($beers) {
	return new JsonResponse($beers['styles']);
});

$app->get('/beer{/id}', function ($request, $response, $next) use ($beers) {
	$id = $request->getAttribute('id');
    if ($id == null) {
		return new JsonResponse($beers['brands']);
    }
    
    $key = array_search($id, $beers['brands']);
    if ($key === false) {
        return new JsonResponse('Not found', 404);
    }
    return new JsonResponse($beers['brands'][$key]);

});

$app->run();