Slim 4 assign twig parameters from middleware - php

Question

I'm trying to upgrade my website's code from Slim v2 to v4. I'm not a hardcore programmer so I'm facing issues.
In Slim v2 I had some middleware where I was able to assign parameters to the Twig view before the route code executed.
Now I'm trying to manage the same with Slim v4 but without success.
I have a container:
$container = new \DI\Container();
I have the view:
$container->set('view', function(\Psr\Container\ContainerInterface $container) {
return Twig::create(__DIR__ . '/views');
});
I try to use this from middleware:
$this->get('view')->offsetSet('fbloginurl', $loginUrl);
But nothing append when the view rendered.
If I try to use the same from the route inside, its working fine.
Example route:
$app->get('/', function ($request, $response, $args) {
$params = array(...);
return $this->get('view')->render($response, 'index.html', $params);
});

Answer 1

There are two possible failures. First, the DI container may always return a new instance, thus it doesn't store the variables in the correct instance and they are not rendered in the twig template. Second, you use a different approach in your route sample. You pass the variables via your $params variable and they are given into the template by this way.
So you may store $this->get('view') in a variable or pass the variables as the third parameter of $params.
EDIT: You could also check, if your variable in your DI\Container already exists and then just return the instance.

Answer 2

So this is a test code:
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Psr\Http\Server\RequestHandlerInterface as RequestHandler;
use Slim\Factory\AppFactory;
use Slim\Views\Twig;
use Slim\Routing\RouteContext;
require 'vendor/autoload.php';
require 'config.php';
lib\Cookie::init();
$container = new \DI\Container();
$container->set('view', function($container) {
return Twig::create(__DIR__ . '/views');
});
$container->set('flash', function ($container) {
return new \Slim\Flash\Messages();
});
$container->get('view')->getEnvironment()->addGlobal('flash', $container->get('flash'));
AppFactory::setContainer($container);
$app = AppFactory::create();
$app->addErrorMiddleware(true, false, false);
$fb = new Facebook\Facebook([
'app_id' => '...',
'app_secret' => '...',
'default_graph_version' => '...',
]);
$beforeMiddleware = function (Request $request, RequestHandler $handler) use ($fb) {
$response = $handler->handle($request);
if (!isset($_SESSION['fbuser'])) {
$helper = $fb->getRedirectLoginHelper();
$permissions = ['email'];
$loginUrl = $helper->getLoginUrl('...', $permissions);
$this->get('view')->offsetSet('fbloginurl', $loginUrl);
}
else {
$this->get('view')->offsetSet('fbuser', $_SESSION['fbuser']);
}
$uri = $request->getUri();
$this->get('view')->offsetSet('currenturl', $uri);
return $response;
};
$app->add($beforeMiddleware);
$app->get('/test', function (Request $request, Response $response, $args) {
$oViewParams = new \lib\ViewParams("home", "", "", "", "");
$oProfession = new \models\Profession();
$oBlogPost = new models\BlogPost();
$oBlogTopic = new models\BlogTopic();
$professions = $oProfession->getProfessionsWithLimit(14);
$posts = $oBlogPost->getMainPagePosts();
echo $this->get('view')->offsetGet('fbloginurl');
$params = array('professions' => $professions,
'posts' => $posts,
'viewp' => $oViewParams->getMassParams());
return $this->get('view')->render($response, 'index.html', $params);
});
$app->run();
When I use echo $this->get('view')->offsetGet('fbloginurl'); within the middleware it shows up. When I use the same within the route there is nothing show up...