Symfony Orientation

Symfony illustrates common PHP application conventions through routing, controllers, services, dependency injection, configuration, console commands, events, validation, security, and reusable components.

Trace A Request

Start with a route and follow it into a controller. Routes may be declared with PHP attributes, YAML, XML, or PHP configuration depending on the repository. Controllers commonly receive services through dependency injection rather than reaching into global state.

<?php

declare(strict_types=1);

namespace App\Controller;

use App\Service\OrderCreator;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\Routing\Attribute\Route;

final class OrderController
{
    #[Route('/orders', methods: ['POST'])]
    public function create(OrderCreator $orderCreator): JsonResponse
    {
        $orderId = $orderCreator->create();

        return new JsonResponse(['id' => $orderId], 201);
    }
}

After the controller, inspect injected services, validation, security rules, persistence, and tests. Configuration commonly lives under config/. Environment values and secrets should remain outside committed configuration.

Useful Console Commands

Symfony's console exposes information that helps when reading a repository:

php bin/console debug:router
php bin/console debug:container
php bin/console list

Follow the installed Symfony version and the repository's established service conventions. Symfony concepts also appear outside full Symfony applications because many projects use individual components such as Console, HttpFoundation, and Cache.