StackPHP Example: Symfony + Zend Framework (ZF1)

app.php

<?php

use Symfony\Component\Debug\Debug;
use Symfony\Component\HttpFoundation\Request;

// Read environment
$env = getenv('SYMFONY_ENV') ?: 'dev';
$debug = (bool) getenv('SYMFONY_DEBUG');
$cache = (bool) getenv('SYMFONY_CACHE');

$classLoader = require_once __DIR__.'/../app/autoload.php';

if ($debug) {
    Debug::enable();
}

$kernel = new AppKernel($env, $debug);
$kernel->loadClassCache();

$kernel = new ZendKernel($kernel);

if ($cache) {
    $kernel = new AppCache($kernel);
    Request::enableHttpMethodParameterOverride();
}

$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();

$kernel->terminate($request, $response);

ZendKernel.php

<?php

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\TerminableInterface;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;

class ZendKernel implements HttpKernelInterface, TerminableInterface
{
    /**
     * @var HttpKernelInterface
     */
    private $app;

    /**
     * Constructor.
     *
     * @param HttpKernelInterface $app
     */
    public function __construct(HttpKernelInterface $app)
    {
        $this->app = $app;
    }

    /**
     * {@inheritdoc}
     */
    public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = true)
    {
        try {
            return $this->app->handle($request, $type, false);
        } catch (ResourceNotFoundException $e) {
            return $this->doHandle($request, $type, $catch);
        } catch (NotFoundHttpException $e) {
            if ($e->getPrevious() instanceof ResourceNotFoundException) {
                return $this->doHandle($request, $type, $catch);
            }

            throw $e;
        }
    }

    /**
     * @see HttpKernelInterface::handle
     */
    private function doHandle(Request $request, $type = self::MASTER_REQUEST, $catch = true)
    {
        ob_start();

        $application = new Zend_Application(
            APPLICATION_ENVIRONMENT,
            APPLICATION_PATH.'/config/legacy/config.ini'
        );

        $application->bootstrap();
        $application->run();

        $headers = headers_list();
        header_remove();

        $response = Response::create(ob_get_clean(), http_response_code());
        foreach ($headers as $header) {
            $pieces = explode(':', $header);
            $headerName = array_shift($pieces);

            $response->headers->set($headerName, trim(implode(':', $pieces)), false);
        }

        return $response;
    }

    /**
     * {@inheritdoc}
     */
    public function terminate(Request $request, Response $response)
    {
        if ($this->app instanceof TerminableInterface) {
            $this->app->terminate($request, $response);
        }
    }
}