Composer is a dependency manager for PHP that allows developers to declare and manage dependencies for PHP applications, similar to tools like npm for Node.js projects. It works by generating autoload files for dependencies so they can be easily included, and handles installing and updating third party libraries and their dependencies. Composer aims to make dependency management easier for PHP projects compared to alternatives like PEAR by allowing dependencies to be installed locally per project rather than globally.

1. COMPOSER
A PHP dependency manager

2. Who am I?
• Ujjwal Ojha
• BSc. CSIT
• Hrevert Technologies
• Web application development

3. Table Of Contents
• Introduction
• What is dependency?
• Why not Pear?
• Installation
• Basic Usage

4. Introduction
• PHP dependency manager
• Very useful to work with third party libraries
• Similar to npm for node.js, Bundler for Ruby, or pip for
Python

5. What is dependency?

6. Recursive Dependencies

7. Two Way Recursive Dependencies

8. Why not Pear?
• Pears installs packages globally
• With Pear, your code is scattered throughout the machine.

9. Installation
mkdir myprojectname
cd myprojectname
curl -s https://getcomposer.org/installer | php

10. Create composer.json
{
"require": {
"silex/silex": "~1.0"
}
}
php composer.phar install

11. Loading composer repositories with package information
Installing dependencies
- Installing psr/log (1.0.0)
Loading from cache
- Installing symfony/routing (v2.2.1)
Downloading: 100%
- Installing symfony/http-foundation (v2.2.1)
Downloading: 100%
- Installing symfony/event-dispatcher (v2.2.1)
Loading from cache
- Installing symfony/http-kernel (v2.2.1)
Downloading: 100%
- Installing pimple/pimple (v1.0.2)
Downloading: 100%
- Installing silex/silex (v1.0.0)
Downloading: 100%
Writing lock file
Generating autoload files
Your
dependencies
dependency
Your
dependency

12. Autoloading
Composer generates an
autoload file for all your
Dependencies

13. Autoloader
Supports
PSR-0 Autoloader
PSR-4 Autoloader
Classmap Autoloader

14. Autoloader usage
<?php
// From your app`s bootstrap.php
include “vendor/autoload.php”;

15. Scripts
Perform custom actions during installation and update
"scripts": {
"post-install-cmd": [
"Sensio...ComposerScriptHandler::buildBootstrap",
"Sensio...ComposerScriptHandler::clearCache",
"Sensio...ComposerScriptHandler::installAssets",
"Sensio...ComposerScriptHandler::installRequirementsFile
"
],
"post-update-cmd": [
“Sensio...ComposerScriptHandler::buildBootstrap",
"Sensio...ComposerScriptHandler::clearCache",
"Sensio...ComposerScriptHandler::installAssets",
"Sensio...ComposerScriptHandler::installRequirementsFile
"
]
},

17. Non-composer packages
{
"repositories": [
{
"type": "package",
"package": {
"name": "smarty/smarty",
"version": "3.1.7",
"dist": {
"url": "http://www.smarty.net/files/Smarty-3.1.7.zip",
"type": "zip"
},
"source": {
"url": "http://smarty-php.googlecode.com/svn/",
"type": "svn"
}
}
}
]
}

18. Private dependencies with Satis
{
"repositories": [
{ "type": "composer", "url": "http://packages.example.org/" }
],
"require": {
"company/package": "1.2.0",
"company/package2": “1.5.2",
}
}

19. Thank You
Questions?
Ujjwal Ojha