Symfony

1. The Big Picture

   Overview of a Symfony application, its structure, and request flow.

2. Routing

   Defining routes with attributes, parameters, requirements, and URL generation.

3. Controllers

   Controllers, Request and Response objects, and handling errors.

4. Twig Templates

   Twig templates, inheritance, and rendering.

5. Service Container

   Dependency injection, autowiring, and service configuration.

6. Configuration

   Configuration files, environments, and env vars.

7. Databases and Doctrine

   Doctrine ORM entities, repositories, and migrations.

8. Forms

   Building, rendering, and processing forms.

9. Validation

   Validating objects with constraints.

10. Security

    Authentication, firewalls, authenticators, and access control.

11. Events

    Event dispatcher, listeners, and subscribers.

12. Messenger

    Messenger bus, messages, handlers, and async transports.

13. Testing

    Functional and unit testing with PHPUnit and WebTestCase.

14. Deployment

    Deployment checklist and production tuning.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

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