Playing with stratigility

example.php

<?php
require_once __DIR__ . '/../vendor/autoload.php';

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

$app = new \Zend\Stratigility\MiddlewarePipe();

$app->pipe('/', function(ServerRequestInterface $request, ResponseInterface $response, callable $next = null) {
    $body = $response->getBody();
    $body->write('This is a message');
    if (!is_null($next)) {
        return $next($request, $response);
    }
});

$app->pipe(function(ServerRequestInterface $request, ResponseInterface $response, callable $next) {
    $body = $response->getBody();
    if (strstr((string)$body, 'message')) {
        $body->write(' more message');
    }

    if (!is_null($next)) {
        return $next($request, $response);
    }
});

$server = \Zend\Diactoros\Server::createServer(
    $app,
    $_SERVER,
    $_GET,
    $_POST,
    $_COOKIE,
    $_FILES
);

$server->listen();