Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you. Composer resolves dependencies declared in a composer.json file and installs the packages into a vendor directory. It supports semantic versioning so you can specify versions and ranges of dependencies. You can use Composer to install WordPress and its plugins/themes by requiring them as dependencies.

1. Using Composer
with WordPress
Micah Wood
@wpscholar
wpscholar.com/wcraleigh2014

2. What is ?

3. Manages
Dependencies

4. Manages Project
Dependencies

5. Manages Project
Dependencies and Versions

6. Simplifies reusing
and sharing of code

7. Why Use Composer?

8. Automatic
Package Installation

9. Consistent !
Versioning

10. Bulk Package
Updates

11. Class and File
Autoloading

12. Documentation of
Dependencies

13. Recursive
Dependencies

14. Eliminates !
Duplication

15. Package !
Discovery

16. Installing Composer

17. Local Install!
$ curl -sS https://getcomposer.org/installer | php
!
Make install global!
$ mv composer.phar /usr/local/bin/composer

18. $ composer diagnose
Check system for common errors

19. How Composer Works

20. composer.json
How you declare your dependencies

21. composer.lock
How Composer stores
your dependencies

22. vendor directory
Where composer installs your packages

23. Specifying Versions

24. Exact Version
1.0.2

25. Range of Versions
>=1.0,<2.0

26. Wildcard Version
1.0.*

27. Next Significant Release Version
~1.2

28. Semantic Versioning
semver.org

29. Major Version
2.3.1
Increment when you make breaking changes

30. Minor Version
2.3.1
Increment when you add backwards compatible features

31. Patch Version
2.3.1
Increment when you make backwards compatible bug fixes

32. Using Composer

33. $ composer init
Create a new composer.json file

34. $ composer validate
Validate your composer.json file

35. $ composer install
Downloads and installs all dependencies

36. $ composer update
Checks for and installs package updates

37. $ composer require package
Adds package to composer.json and installs

38. $ composer remove package
Removes package from composer.json and uninstalls

39. $ composer create-project package
Downloads project and runs `composer install`

40. $ composer search package
Discover packages on packagist.org

41. Using Composer
with WordPress

42. $ composer require johnpbloch/wordpress
Add WordPress as a dependency

43. $ composer require composer/installers
Enables WordPress themes and plugins to be put in their respective directories

44. Setup WordPress Paths
Places WordPress and its themes and plugins in their respective directories

45. $ composer create-project wpscholar/wp-skeleton
Setup a new WordPress project

46. Live Demo

47. Questions?
Micah Wood
@wpscholar
!
wpscholar.com/wcraleigh2014