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Symfony

Overview​

Symfony is a PHP component library and full-stack framework used by Drupal, Magento, and many enterprise apps. Its HttpKernel, DependencyInjection, and Console components are often adopted piecemeal even outside “full Symfony” projects.

Key concepts​

  • Bundles — Feature packages wired into the kernel.
  • Services & DI — Autowiring, tags, compiler passes.
  • Routing & controllers — Attributes or YAML/XML/PHP config.
  • Doctrine ORM — Common pairing for persistence.
  • Messenger — Async message handling and queues.

Symfony HTTP kernel flow​

Sample: attribute route (PHP 8+)​

<?php

namespace App\Controller;

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\Routing\Attribute\Route;

class HealthController
{
    #[Route('/api/health', name: 'health', methods: ['GET'])]
    public function __invoke(): JsonResponse
    {
        return new JsonResponse(['ok' => true]);
    }
}

References​