Nils Adermann github.com/composer
Twitter @naderman packagist.org & getcomposer.org
Using a Composed Project (I)
git clone https://github.com/igorw/trashbin
Cloning into trashbin...
cd trashbin/
curl -s htt...
Using a Composed Project (II)
php composer.phar install
Installing from lock file
- Package symfony/class-loader (2.1.0-de...
Using a Composed Project (III)
vendor/
.composer/
bin/
pimple/
pimple/
predis/
predis/
service-provider/
silex/
silex/
sym...
Composer Goals
Ease of Use
Project Dependencies - No globally
installed packages
Flexibility/Customizability
Nils Adermann...
The Basics: Defining Dependencies
composer.json
Located in project root directory
Defines dependencies
{
"require": {
"sil...
The Basics: Package Metadata
{
"name": "predis/predis",
"type": "library",
"description": "Flexible and feature-complete P...
Packagist
Central composer package repository
Open to packages from anyone
GitHub Integration: Packages from tags & branch...
Demo: packagist.org
Nils Adermann github.com/composer
Twitter @naderman packagist.org & getcomposer.org
composer.lock (I)
List of packages & versions
If available, composer install uses composer.lock
instead of composer.json
C...
composer.lock (II)
Commit composer.lock in your VCS and ship it with
your releases
Everyone on a team works with exactly t...
Development Installation
Allows you to commit changes to projects in vendor/
php composer.phar install --dev
Installing fr...
Autoloading
"autoload": {
"psr-0": {"Predis": "lib/"}
}
vendor/.composer/
autoload_namespaces.php
autoload.php
ClassLoader...
Custom Repositories
"repositories": {
"my-repo": {
"composer": {
"url": "http://example.org"
}
},
"MyRepo": {
"vcs": {
"ur...
Depending on packages without composer.json
"repositories": {
"some vendor repo": {
"package": {
"name": "vendor/package",...
Other Dependency Types: Replace
Useful if a patch is not available in upstream
"name": "myvendor/predis",
"replace": {
"pr...
Other Dependency Types: Provide
my/cache is a virtual package, it does not exist
"name": "my/library",
"require": {
"my/ca...
Other Dependency Types
Conflict
If vendor/a conflicts with vendor/b, they cannot be both
installed
Recommend
If vendor/a r...
Dependency Resolution with SAT
All packages in all repositories are collected in a package pool
Dependencies between all p...
Composer Repositories vs.
PEAR Channels
Repositories allow easy proxying of packages:
Proxy only reviewed open source pack...
Composer as a reusable library
Phar distribution with composer-installable
plugins (Beau Simensen)
phpBB4: Web UI for Plug...
Thank you!
Learn more & contribute
packagist.org/about-composer
packagist.org/about
github.com/composer
groups.google.com/...
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Composer (PHP Usergroup Karlsruhe)

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Composer (PHP Usergroup Karlsruhe)

  1. 1. Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  2. 2. Using a Composed Project (I) git clone https://github.com/igorw/trashbin Cloning into trashbin... cd trashbin/ curl -s http://getcomposer.org/installer | php All settings correct for using Composer Composer successfully installed to: /home/naderman/projects/composer/demo/phpugka/composer.phar Use it: php composer.phar Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  3. 3. Using a Composed Project (II) php composer.phar install Installing from lock file - Package symfony/class-loader (2.1.0-dev) Downloading Unpacking archive Cleaning up [...] - Package predis/predis (master-dev) Downloading Unpacking archive Cleaning up - Package twig/twig (1.6.0-dev) Downloading Unpacking archive Cleaning up Generating autoload files Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  4. 4. Using a Composed Project (III) vendor/ .composer/ bin/ pimple/ pimple/ predis/ predis/ service-provider/ silex/ silex/ symfony/ browser-kit/ class-loader/ css-selector/ dom-crawler/ event-dispatcher/ finder/ http-foundation/ http-kernel/ routing/ twig/ twig/ Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  5. 5. Composer Goals Ease of Use Project Dependencies - No globally installed packages Flexibility/Customizability Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  6. 6. The Basics: Defining Dependencies composer.json Located in project root directory Defines dependencies { "require": { "silex/silex": ">=1.0.0-dev", "symfony/finder": ">=2.1-dev", "twig/twig": ">=1.4", "predis/service-provider": "master-dev" } } Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  7. 7. The Basics: Package Metadata { "name": "predis/predis", "type": "library", "description": "Flexible and feature-complete PHP client library for Redis", "keywords": ["nosql", "redis", "predis"], "homepage": "http://github.com/nrk/predis", "license": "MIT", "version": "0.7.1" "authors": [ { "name": "Daniele Alessandri", "email": "suppakilla@gmail.com", "homepage": "http://clorophilla.net" } ], "require": { "php": ">=5.3.0" }, "autoload": { "psr-0": {"Predis": "lib/"} } } Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  8. 8. Packagist Central composer package repository Open to packages from anyone GitHub Integration: Packages from tags & branches Browse & Search Packages Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  9. 9. Demo: packagist.org Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  10. 10. composer.lock (I) List of packages & versions If available, composer install uses composer.lock instead of composer.json Created by composer install Updated by composer update Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  11. 11. composer.lock (II) Commit composer.lock in your VCS and ship it with your releases Everyone on a team works with exactly the same dependency versions When deploying, all machines run exactly the same dependency versions Users will never get dependency versions that you did not test with Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  12. 12. Development Installation Allows you to commit changes to projects in vendor/ php composer.phar install --dev Installing from lock file [...] - Package predis/service-provider (master-dev) Cloning v0.2.3 - Package pimple/pimple (1.0.0-dev) Cloning 321db91e49b6cf8cbeed58d8db662d40de96d2c3 - Package predis/predis (master-dev) Cloning v0.7.1 - Package twig/twig (1.6.0-dev) Cloning 8256bfa05c1604bf24d8c0d1627822b4fa503e2f Generating autoload files Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  13. 13. Autoloading "autoload": { "psr-0": {"Predis": "lib/"} } vendor/.composer/ autoload_namespaces.php autoload.php ClassLoader.php installed.json Trashbin uses the generated autoloader require_once __DIR__.'/../vendor/.composer/autoload.php'; use SilexApplication; use SilexExtensionTwigExtension; use SymfonyComponentFinderFinder; use SymfonyComponentHttpFoundationResponse; $app = new Application(); Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  14. 14. Custom Repositories "repositories": { "my-repo": { "composer": { "url": "http://example.org" } }, "MyRepo": { "vcs": { "url": "git://example.org/MyRepo.git" } }, "example org": { "pear": { "url": "http://pear.example.org" } }, "packagist": false } Composer Repository Implementations (packages.json) Packagist Satis Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  15. 15. Depending on packages without composer.json "repositories": { "some vendor repo": { "package": { "name": "vendor/package", "version": "1.0.0", "dist": { "url": "http://example.org/package.zip", "type": "zip" }, "source": { "url": "git://example.org/package.git", "type": "git", "reference": "tag name, branch name or commit hash" } } } }, "require": { "vendor/package": "1.0.0" } Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  16. 16. Other Dependency Types: Replace Useful if a patch is not available in upstream "name": "myvendor/predis", "replace": { "predis/predis": "0.7.*" } Trashbin depends on predis/service-provider which depends on predis/predis php composer.phar update myvendor/predis is installed instead of predis/predis Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  17. 17. Other Dependency Types: Provide my/cache is a virtual package, it does not exist "name": "my/library", "require": { "my/cache": "1.0.0" } "name": "my/apc-store", "provide": { "my/cache": "1.0.0" } "name": "my/memcache-store", "provide": { "my/cache": "1.0.0" } Installing my/library will install either my/apc-store or my/memcache-store If you require another package providing my/cache, neither will be installedNils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  18. 18. Other Dependency Types Conflict If vendor/a conflicts with vendor/b, they cannot be both installed Recommend If vendor/a recommends vendor/b, it will be installed unless you specify --no-install-recommends Suggest If vendor/a suggests vendor/b, it will only be installed if you specify --install-suggests Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  19. 19. Dependency Resolution with SAT All packages in all repositories are collected in a package pool Dependencies between all packages are turned into boolean rules: install B (version 1 or 2) (B1|B2) A requires B (version 1 or 2): (-A|B1|B2) A conflicts with B (version 1 and 2): (-A|-B1), (-A|-B2) C and D provide E: (-E|C|D) B2 updates/obsoletes B1 (-B1|-B2) Example (-A|B1|B2) (-B2|C) (A) (-B1|-B2) (-A|-C) Now use a SAT solver to find boolean values for A, B1, B2, C so that all rules are true A, B1, -B2, -C If a variable is true, it will be installed Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  20. 20. Composer Repositories vs. PEAR Channels Repositories allow easy proxying of packages: Proxy only reviewed open source packages to a company repository Easily aggregate all open source packages on a central repository PEAR requires explicit referencing of a channel when defining dependencies: Replacing a single package with your own in a chain of dependencies is impossible Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  21. 21. Composer as a reusable library Phar distribution with composer-installable plugins (Beau Simensen) phpBB4: Web UI for Plugin Management Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
  22. 22. Thank you! Learn more & contribute packagist.org/about-composer packagist.org/about github.com/composer groups.google.com/forum/#!forum/composer-dev Nils Adermann github.com/composer Twitter @naderman packagist.org & getcomposer.org
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