Symfony 4 introduced several major changes including a new directory structure without bundles, use of environment variables instead of parameters.yaml, and Symfony Flex for defining application dependencies and configuration. It also improved the developer experience with features like automatic wiring and a bundle for generating common application code.

1. A dive into
Symfony 4

2. A long time ago...
Symfony 2 was born

3. Key Concepts
Components
Bundles
Distributions

4. Time passed by...

5. How did it go?

6. Bene... ma non benissimo :-(

7. Bene... ma non benissimo :-(

8. Distributions
Initial idea: one distribution per app type
• Standard Distribution
• Rest Distribution
• Cms Distribution
• ...

9. Distributions
In Reality: distributions never took off, everybody uses
Standard Distribution and removes stuff manually

10. Bundles
Initial Idea: organise reusable code in
bundles

11. Bundles
Have you ever seen this organisation?
ShopBundle
CmsBundle
AdminBundle
...

12. Bundles
Have you ever seen this organisation?
ShopBundle
CmsBundle
AdminBundle
Common|General| ... | Bundle

13. Bundles
Vendor code is reusable
Your App code is not

14. Bundles
Installing/Removing a Bundle is mostly a manual operation
# composer require/remove <bundle>
# add/remove to AppKernel.php
# add/remove configurations

15. DX initiative
Symfony has a steep learning curve compared to other
frameworks
The Developer eXperience initiative aims to create a
better onboarding and framework usage experience

16. DX initiative
Symfony has a steep learning curve compared to other
frameworks
The Developer eXperience initiative aims to create a
better user experience

17. Symfony 4 was born...

18. New Directory Structure

19. New Directory Structure
The idea behind that is to have a more
intuitive structure

21. New Directory Structure
bin
config
public
src
var
vendor

22. New Directory Structure
bin
config
public
src
var
vendor
index.php
...
favicon.ico
robots.txt
bundles

23. New Directory Structure
bin
config
public
src
var
vendor
cache/
log/
session/

24. New Directory Structure
bin
config
public
src
var
vendor
Kernel.php
Entity
Repository
Command
Controller
...

25. No Bundles!

26. New Directory Structure
bin
config
public
src
var
vendor
bundles.php
routes.yaml
services.yaml
doctrine.yaml
security.yaml
...
packages/
dev/
routes.yaml
test/
routes.yaml
prod/
routes.yaml

27. return [
SymfonyBundleFrameworkBundleFrameworkBundle::class => ['all' => true],
SymfonyBundleWebServerBundleWebServerBundle::class => ['dev' => true],
SymfonyBundleMakerBundleMakerBundle::class => ['dev' => true],
SymfonyBundleDebugBundleDebugBundle::class => ['dev' => true, 'test' => true],
SymfonyBundleSecurityBundleSecurityBundle::class => ['all' => true],
];

28. New Directory Structure
assets
bin
data
config
public
src
templates
tests
translations
var
vendor

29. Where is parameter.yaml?

30. Environment Variables

31. Environment Variables
Symfony already has them eg.
SYMFONY__ENV

32. Environment Variables
Now resolved at runtime! You can change
them without touching the app
https://www.12factor.net/config

33. Environment Variables
doctrine:
dbal:
driver: 'pdo_sqlite'
server_version: '3.15'
charset: utf8mb4
url: ‘%env(resolve:DATABASE_URL)%'
https://symfony.com/blog/new-in-symfony-3-4-advanced-environment-variables

34. .env
###> symfony/framework-bundle ###
APP_ENV=dev
APP_SECRET=2a0f335581bd72b6077840e29d73ba36
TRUSTED_PROXIES=127.0.0.1,127.0.0.2
TRUSTED_HOSTS=localhost,example.com,127.0.0.1
###< symfony/framework-bundle ###

35. index.php
if (!isset($_SERVER['APP_ENV'])) {
if (!class_exists(Dotenv::class)) {
throw new RuntimeException('APP_ENV environment variable is not defined.’);
}
(new Dotenv())->load(__DIR__.'/../.env');
}
$env = $_SERVER['APP_ENV'] ?? 'dev';
$debug = (bool) ($_SERVER['APP_DEBUG'] ?? ('prod' !== $env));

36. Symfony Flex

37. Flex
A new way to create and evolve a Symfony application
Composition over inheritance
Start small and add what you need

38. Flex
Integrates into composer workflow
Automates bundles installation and configuration

39. Flex

40. Flex

41. Flex
{
"bundles": {
"SymfonyBundleFrameworkBundleFrameworkBundle": ["all"]
},
"copy-from-recipe": {
"config/": "%CONFIG_DIR%/",
"public/": "%PUBLIC_DIR%/",
"src/": "%SRC_DIR%/"
},
"composer-scripts": {
"make cache-warmup": "script",
"assets:install --symlink --relative %PUBLIC_DIR%": "symfony-cmd"
},
"env": {
"APP_ENV": "dev",
"APP_DEBUG": "1",
"APP_SECRET": "%generate(secret)%"
},
"gitignore": [
".env",
"/public/bundles/",
"/var/",
"/vendor/"
]
}
https://medium.com/@fabpot/symfony-4-automate-your-workflow-fbbf609b5a1d

42. symfony.sh

43. recipes
https://github.com/symfony/recipes
https://github.com/symfony/recipes-contrib

44. alias
orm, twig, security, form, validation, ...

45. So long Standard Edition...

46. composer require symfony/website-skeleton

47. composer require symfony/skeleton

48. So long Silex...
https://symfony.com/blog/the-end-of-silex

49. Other Bits...

50. From Sf 3.* to Sf 4
Symfony 3.4 is Symfony 4 with and additional compat layer
Migration path: upgrade to 3.4, remove deprecations,
update to 4
https://symfony.com/doc/current/setup/flex.html#upgrade-to-flex

51. Autowiring
Wait 5 minutes... :-P

52. composer require make
MakerBundle

53. make:auth
make:command
make:controller
make:crud
make:entity
make:fixtures
make:form
make:functional-test
make:migration
make:serializer:encoder
make:subscriber
make:twig-extension
make:unit-test
make:user
make:validator
make:voter

54. Fastest PHP Router
https://symfony.com/blog/new-in-symfony-4-1-fastest-php-router

55. VarDumper Server
https://symfony.com/blog/new-in-symfony-4-1-vardumper-server

56. Messenger Component
https://symfony.com/blog/new-in-symfony-4-1-messenger-component

57. Panther
https://symfony.com/blog/introducing-symfony-panther-a-browser-
testing-and-web-scrapping-library-for-php

58. Moar Improvements
https://symfony.com/blog/new-in-symfony-4-1-exception-improvements
https://symfony.com/blog/new-in-symfony-4-1-session-improvements
https://symfony.com/blog/new-in-symfony-4-1-self-updating-debug-toolbar
https://symfony.com/blog/new-in-symfony-4-1-console-improvements
https://symfony.com/blog/new-in-symfony-4-1-form-field-help
https://symfony.com/blog/new-in-symfony-4-1-faster-serializer
https://symfony.com/blog/new-in-symfony-4-1-misc-improvements-part-1
https://symfony.com/blog/new-in-symfony-4-1-misc-improvements-part-2
https://symfony.com/blog/new-in-symfony-4-1-misc-improvements-part-3
https://symfony.com/blog/new-in-symfony-4-1-misc-improvements-part-4
https://symfony.com/blog/new-in-symfony-4-2-samesite-cookie-configuration
https://symfony.com/blog/new-in-symfony-4-2-varexporter-component
https://symfony.com/blog/new-in-symfony-4-2-intlmessageformatter
https://symfony.com/blog/new-in-symfony-4-2-auto-secure-cookies

59. Thank you!
Michele Orselli
_orso_
micheleorselli / ideatosrl
mo@ideato.it
https://joind.in/talk/2a90f