simen-backend-zf3mw/src/App/Action/HomePageAction.php

<?php

namespace App\Action;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Zend\Diactoros\Response\JsonResponse;

class HomePageAction
{

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next = null)
    {
        return new JsonResponse([
            'welcome' => 'Congratulations! You have reached our API endpoint.',
        ]);
    }
}