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Controllers

We can generate controllers with Simfony Maker. 
 
# To save time, you can install Symfony Maker.  
# Then Symfony can generate a new controller class.  

composer create-project symfony/skeleton controllers
cd controllers/

composer require doctrine/annotations
composer require --dev symfony/maker-bundle

php bin/console make:controller MyController
    # created: src/Controller/MyController.php
    # created: templates/my/index.html.twig

symfony server:start
http://localhost:8000/my    
    # Welcome to your new controller

Request

Request object can be passed as argument. 
 
/**
 * MyController
 * 
 * Symfony will pass the Request object to any controller argument 
 * that is type-hinted with the Request class.
 * 
 * http://localhost:8000/my             # Welcome to your new controller
 * http://localhost:8000/info?page=3    # Page 3 is Not Ajax
 */

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class MyController extends AbstractController
{
    #[Route('/my', name: 'my')]
    public function index(): Response
    {
        return $this->json([
            'message' => 'Welcome to your new controller!',
            'path' => 'src/Controller/MyController.php',
        ]);
    }

    #[Route('/info')]
    public function info(Request $request): Response
    {
        $page = $request->query->get('page');
        $ajax = $request->isXmlHttpRequest() ? 'Ajax' : 'Not Ajax';
        
        return new Response(
            "Page $page is $ajax"
        );
    }
}

Services

To use a service in a controller type-hint an argument. 
 
/**
 * LogController
 * 
 * Symfony comes packed with a lot of usefull classes (services).
 * When you need a service in controller ...
 * type-hint an argument with its class (or interface) name.

 * http://localhost:8000/log/123
 *      # var/log/dev.log
 *      # [2022-02-12] app.INFO: We are loggin id 123   
 * 
 * http://localhost:8000/setsession     # Session foo set
 * http://localhost:8000/getsession     # Session foo get: bar
 */
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\HttpFoundation\Response;
use Psr\Log\LoggerInterface; # composer require logger
use Symfony\Component\HttpFoundation\Session\SessionInterface;

class LogController extends AbstractController
{
    #[Route("/log/{id}")]
    public function index($id, LoggerInterface $logger)
    {
        $logger->info("We are loggin id $id");
        return new Response('logging');
    }

    #[Route("/setsession")]
    public function setsession(SessionInterface $session)
    {
        $session->set('foo', 'bar');
        return new Response("Session foo set");
    }

    #[Route("/getsession")]
    public function getsession(SessionInterface $session) 
    {
        $foo = $session->get('foo', 'bar');
        return new Response("Session foo get: $foo");
    }
}

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Symfony, Doctrine