ion-http-middleware-dispatcher.php

<?php

use Psr\Http\Message\ResponseInterface;
use Ion\Http;
use Ion\Http\{
    MiddlewareInterface,
    Middleware\Dispatcher,
    Middleware\RunFilterTrait,
    Response
};

include '../../vendor/autoload.php';

$dp = new Dispatcher();

$dp->append(new class implements MiddlewareInterface {
    use RunFilterTrait;

    protected function run(): ResponseInterface
    {

        $this->response->getBody()->write("Hello from anon!\n");
        return $this->response->withHeader('some-header', 'some-value');
    }
});
$dp->prepend(function($request, $response, $next) {

    $response->getBody()->write("Hello from prepend closure!\n");

    return $next($request, $response);
});
$dp->append(function($request, $response, $next) {

    $response->getBody()->write("Hello from append closure!\n");

    return $next($request, $response);
});

$dp->append(new class implements MiddlewareInterface {
    use RunFilterTrait;

    protected function filter(ResponseInterface $response): ResponseInterface
    {

        $parts = array_map(function($line) {

            return '<span style="color: red">'.$line.'</span>';
        }, explode("\n", (string)$response->getBody()));

        $response->getBody()->rewind();
        $response->getBody()->write(implode("<br>", $parts));

        return $response;
    }
});

$resp = $dp->dispatch(Http::getServerRequest(), new Response());

echo '<pre>';
var_dump($resp, (string)$resp->getBody());