This document discusses the key changes and new features in Symfony 4. Symfony 4 is 30% smaller than Symfony 3 due to removing bundle inheritance. It introduces Symfony Flex for dependency management, the MakerBundle for generating code, and updates to components like Dependency Injection, Workflow, Caching, and Dotenv.

1. SYMFONY4
What’s New?

2. “Symfony is a set of PHP Components,
a Web Application framework, a
Philosophy, and a Community — all
working together in harmony.

3. KEYNOTE
➤ Introduction
➤ What’s new?
➤ Monolith VS Microservice
➤ Symfony Flex
➤ Maker Bundle
➤ New Components!

4. SYMFONY ROADMAP

5. WHAT’S NEW?
➤ 30% Smaller Symfony3
➤ No more bundle inheritance!
➤ Bundles App
➤ Dotenv Component
➤ DI - Auto-configure and auto-wiring services
➤ Caching Component

6. SMALLER?

7. NO BUNDLES INHERITANCE
• Controllers: define a route with the same path as the controller you want to override and implement your own logic.
• Templates: use the common template overriding mechanism with the traditional app/Resources/<BundleName>/views/
<templateName>.html.twig dir or the new templates/bundles/<BundleName>/<templateName>.html.twig dir on Symfony 3.4 and
higher; you can also use Twig namespaces to define new templates under the same namespace as the bundle you want to
customize.
• Routing: don't load the bundle routes or apply the same technique as controllers.
• Services and Configuration: use compiler passes or service decoration.
• Entities: not possible unless the bundle provides a mapped superclass.
• Forms: use form extensions.
• Validation: not possible unless the bundle provides validation groups.
• Translations: not related to bundle inheritance; just override the right translation domain.

8. NO BUNDLES!

9. BUNDLES DEFINITION

10. BUNDLES DEFINITION

11. BUNDLES CONFIG - SYMFONY 3!

12. BUNDLES CONFIG - SYMFONY 4

13. Monolith vs Micro
➤ Includes Everything!
➤ Silex VS. Symfony SE
➤ It ships with code that isn‘t
used in all individual projects.
The Symfony SE is often
perceived as being „big“.
➤ Removing not needed
functionality is a cumbersome
task.

16. SYMFONY FLEX 🎁

17. What is Symfony Flex?
• Flex prefers composition over inheritance.
• New project start with almost no dependencies.
• Only needed features are added by developers.
• hooks into the Composer workflow
• automatically enables Symfony bundles
• executes predefined recipes when packages are installed
• recipes are removed when packages are uninstalled

18. FLEX RECIPE!

19. The supported environments are dev, prod, test and all (which enables the bundle in all environments):
FLEX RECIPE!
The previous recipe is transformed into the following PHP code:

20. FLEX RECIPES - CONTRIBUTIONS

21. FLEX RECIPES - INTERACTIVE

22. FLEX RECIPES - INTERACTIVE

23. DISCOVER ALIASES AND PACKS

24. MAKER BUNDLE
The update of SensioGeneratorBundle, Use make: instead of generate:

25. MAKER BUNDLE COMMANDS

26. COMPONENTS
➤ DotENV
➤ Dependency Injection
➤ Workflow
➤ Cache

27. DOTENV COMPONENT
The Dotenv Component parses .env files to make environment variables
stored in them accessible via getenv(), $_ENV or $_SERVER.
Access the value with getenv() in your code:

28. DEPENDENCY INJECTION

29. WORKING WITH INTERFACES

30. AUTOWIRING - WORKING WITH INTERFACES

32. PUBLIC SERVICE

33. PUBLIC SERVICE

34. ➤ Place: the states a workflow can be in
➤ Transition: an action that brings the workflow from one place into another
➤ Definition: the places of a workflow and the transitions to get from one place to another
➤ Marking: the current state of the workflow, stored in a MarkingStore
WORKFLOW COMPONENT

35. CREATE WORKFLOW

36. CREATE WORKFLOW

37. CREATE WORKFLOW

38. WORKFLOW EVENTS
➤ workflow.leave before a place is left
➤ workflow.transition before a transition is applied
➤ workflow.enter before a place is entered
➤ workflow.entered after a place has been entered
➤ workflow.completed after a transition was applied
➤ workflow.announce announces all enabled transitions
More On workflow: twig functions, more events check: https://symfony.com/doc/current/workflow/usage.html

39. THE CACHE COMPONENT
➤ The Cache component provides an extended PSR-6 implementation as well as a PSR-16 "Simple Cache"
implementation for adding cache to your applications. It is designed to have a low overhead and it ships with
ready to use adapters for the most common caching backends.
➤ support to convert PSR-16 caches to PSR-6 adapters and vice versa.
➤ i.e: PSRs stands for PHP Standard Recommendations

40. SIMPLE CACHING (PSR-16)

41. MORE ADVANCED CACHING (PSR-6)

42. ITEM INTERFACE

43. POOL INTERFACE

44. MORE ADVANCED CACHING (PSR-6)

45. CREATE CUSTOM POOL
Cleaning Cache Pools

46. CONTACT ME
➤ salma.abdelhady@tajawal.com
➤ https://github.com/SalmaAbdelhady
➤ https://www.linkedin.com/in/salmahabdelhady/