A simple middleware runner for PSR7

Runner.php

<?php

declare(strict_types=1);

namespace App;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

class Runner
{
    /** @var callable[] */
    private $queue;

    public function __construct(array $queue)
    {
        $this->queue = $queue;
    }

    public function __invoke(ServerRequestInterface $request, ResponseInterface $response)
    {
        $middleware = array_shift($this->queue);
        if (null === $middleware) {
            // Default
            return function (ServerRequestInterface $request, ResponseInterface $response, callable $next) {
                return $response;
            };
        }

        return $middleware($request, $response, $this);
    }
}

Hello! I am learning this middleware thing and while I was researching how to create middleware runner I found this gist. I tried to recreate it another way. Could you comment on that?

https://gist.github.com/mkoske/7a179a28a13d330829c4ed25abc6b303