Symfony is a full-stack PHP framework and set of reusable PHP components that provides tools and libraries to build web applications. The document introduces Symfony and explains how to install it using Composer, describes some key components like routing and dependency injection, and encourages readers to try it for themselves.

1. Symfony is not scary

2. Is it scary?..

3. Is it scary?.. No! Let me try it!!!
- Interior
- Driving
- Engine
- Assembly
- Service
- etc

4. Symfony is not scary → Why I love Symfony2

5. Just try it!
$ curl -s http://getcomposer.org/installer | php
$ php composer.phar create-project
symfony/framework-standard-edition
/var/www/symfony/
$ cd /var/www/symfony/
$ php app/check.php (PHP >= 5.3.2, etc)

6. Get Symfony using Composer

7. Composer — dependency manager
for PHP

8. Composer.json{
'autoload': {
'psr-0': {}
}
'name': 'My Project'
'description': 'Very cool one'
'require': {
'php': '>=5.3.3',
'symfony/class-loader': '2.2.*',
}
}

10. Composer: run your PHP script

11. Time to look what we've got

13. Some demo included

15. Symfony is both:

Full-stack framework

Set of decoupled and standalone components

16. What are the Symfony components?
Symfony components are:
– Set of independent components
– Each can be used separately
– High quality coded, tested and documented
Symfony components are just bricks but you're
completely responsible to glue them

17. The list of Symfony2 components
Class loader
Config
Console
CssSelector
Dependency Injection
Form
Event Dispatcher
Http Foundation
Http Kernel
Routing
Security
Yaml

18. What is bundle
Bundle — set of files which implement single
feature
Generate bundle skeleton
$ php app/console generate:bundle
--namespace=BundleFolder/NameBundle
--format=annotation

19. What is bundle
Templates go there
Database mappers
Request → Response

20. Controller: all together

21. Controller: route
URL and name of route

22. Controller: template
Look for template in:
./Resources/views/Account/index.html.twig

23. Controller: get data from DB
Fetch Doctrine
data manager
Get data from repository

24. Twig
Syntax is very simple:
{{ something }} - «Print something»
{% something %} - «Do something»

25. Twig
Print var:
{{ var }}
«var» can be even an object. With __toString() method
public function __toString()
{
return $this->name;
}

26. Twig
Concise:
<?php echo $var ?> → {{ var }}
<?php echo htmlspecialchars($var, ENT_QUOTES, 'UTF-8' ?>
{{ var |e }}

27. Twig: documentation

28. Twig: base template example

29. Twig: inheritance

30. Need smth Twig doesn't provide?
Just do it!

31. Symfony and inspiration
How to rescue your PHP project with Symfony2
components
http://habrahabr.ru/post/146521/
http://www.slideshare.net/xavierlacot/symfony2-
components-to-the-rescue-of-your-php-
projects

32. Create your own framework on top
of Symfony components
Recipe from Fabien Potencier
http://fabien.potencier.org/article/50/create-your-
own-framework-on-top-of-the-symfony2-
components-part-1

33. Symfony2 components: Console
Some examples of usage
$ php app/console doctrine:generate:entities
Name/MyBundle/Entity/SomeEntity
- generates getters and setters for SomeEntity
$ php app/console container:debug
list of all available services

34. Symfony2 components: Console

35. Http Foundation
Request Response

36. Http Foundation: Request

37. Http Foundation: Response

38. Routing component

39. Services: Dependency Injection

40. Benefits:
Only one instance of Mailer which can be used
in entire application
Centralized configuration of Mailer
It can be replaced by another service

41. Services container (DIC)
Step 1: Create class
Step 2: Register it as service by adding to the
service container
Step 3 ... n: Use it

42. Create class

43. Register as service

44. Let's make example more complicated
Step 1: Create one more class
Step 2: Inject service to it
Step 3: Register it as service as well

45. Create class and inject service

46. Register new class as service

47. Use it

48. Let's improve it. Load services from file

49. Service.yml become a config file

50. Http Kernel

51. Request → Response flow

52. Events and listeners
Event 1 in HttpKernel->handle(): kernel.request
I.e. Security listener can throw Response object
with 403 Access denied response

53. Symfony2 is very kind:
For visitors
For developers

54. Symfony2 is very fast
Response class to manage HTTP cache:
$response = new Response();
$response->setMaxAge(600);
$date = new DateTime();
$date->modify('+600 seconds');
$response->setExpires($date);

55. Symfony2 dev mode

56. Symfony2 dev mode

57. Symfony2 dev mode

58. Symfony2 follows standards...
Autoloading standard: PSR-0
Basic coding style: PSR-1
Coding style: PSR-2
http://www.php-fig.org/

59. … which means:
It heavily uses namespaces, OOP, SOA, design
patterns, etc
http://php.net/manual/en/language.namespaces.php
http://en.wikipedia.org/wiki/Software_design_pattern
http://en.wikipedia.org/wiki/Service-
oriented_architecture

60. I'm almost finished
Yellow: development
Blue: stable
Green: maintenance
Since 3 June 2013 –
long time support
for v. 2.3

61. Symfony2 bundles

62. Try Symfony2
But be careful — it can become
addictive from the very first
encounter :)

63. Questions
valeriy.tuz@gmail.com +380 67 505 42 76