1. An introduction to symfony 2 for symfony 1 developers By Giorgio Cefaro

2. What is Symfony 1? Symfony is a full-stack framework, a library of cohesive classes written in PHP. It provides an architecture, components and tools for developers to build complex web applications faster. from symfony-project.com

3. What is Symfony 2? “ First, Symfony2 is a reusable set of standalone, decoupled, and cohesive PHP components that solve common web development problems. Then, based on these components, Symfony2 is also a full-stack web framework.” “ I don't like MVC because that's not how the web works. Symfony2 is an HTTP framework; it is a Request/Response framework. That's the big deal. The fundamental principles of Symfony2 are centered around the HTTP specification.” from F. Potencier blog http://fabien.potencier.org/article/49/what-is-symfony2

6. Complex controller layer

7. Multi-application architecture

8. Application/plugin level routing

10. Simpler Controller objects

11. Single application

12. Global routing

13. Code organized in bundles

14. A bundle is like a symfony 1 plugin

15. Even Symfony 2 core components are distributed as bundles

17. Not fully replaceable (ok, let's say heavy hacking needed!)

18. “ Distributed” over applications, plugins, modules, filters...

20. A base Controller class is supplied with several helper methods and can be used as standalone component

21. No routing, no party! Access to controller actions inside bundles MUST go through routing pattern matching

23. Lots of yml files (app, factories, database, security, cache, etc ) distributed through apps, plugins and modules

25. Less configuration files

26. The sole config.yml is incredibly powerful

27. With config.yml and routing.yml you can do almost everything :-)

29. Service configuration limited to standard components

30. All mixed up in factories.yml

32. Dependency Injection for full decoupling and high testability

33. Public and private services, tags, aliases

37. Configurable via Yaml, xml, annotations or PHP

38. Validators are called via the Service Container

41. Active Record

43. Entities are independent from OR[D]M

44. Entities are mapped to DB via metadata definition (Yaml, xml, or annotations)

50. In functional tests internal objects can be fully inspected (kernel and DI container too!)

51. Should I move to Symfony 2? Yes.

52. Giorgio Cefaro Twitter: @giorrrgio linkedin.com/in/giorgiocefaro