example.php

<?php

use Zend\Diactoros\Response;
use Zend\Diactoros\Server;
use Zend\Stratigility\MiddlewarePipe;
use function Zend\Stratigility\middleware;

require 'vendor/autoload.php';

$app = new MiddlewarePipe();

$server = Server::createServer([$app, 'handle'], $_SERVER, $_GET, $_POST, $_COOKIE, $_FILES);

$app->pipe(middleware(function ($req, $handler) {
    $calls   = $req->getAttribute('calls') ?? [];
    $calls[] = __LINE__;
    
    return $handler->handle($req->withAttribute('previousCalls', $calls));
}));

$app->pipe(middleware(function ($req, $handler) {
    $calls   = $req->getAttribute('calls') ?? [];
    $calls[] = __LINE__;
    
    return $handler->handle($req->withAttribute('calls', $calls));
}));

$app->pipe(middleware(function ($req, $handler) {
    $calls   = $req->getAttribute('calls') ?? [];
    $calls[] = __LINE__;
    
    $response = new Response();
    $response->getBody()->write(json_encode($calls);

    return $response;
}));

$server->listen(function ($req, $res) {
    return $res;
});

gistfile1.txt

Should print [16, 23, 30]