Composer is an tool for dependency management in PHP. It permits you to declare the subordinate libraries your task needs and it will install them in your project for you.
The issue that Composer solve is this: You have a project that relies on upon various libraries. Some of those libraries rely on upon different libraries. You announce the things you rely on upon. Composer find out which forms of which bundles need to be introduced, and introduces them into your project.
Introducing Composer mainly is a matter of simply running the installer in your project directory. The main step is to introduce Composer. Run the following command from the terminal:
# cd /tmp
# curl -sS https://getcomposer.org/installer | php
All settings correct for using Composer
Composer successfully installed to: /tmp/composer.phar
Use it: php composer.phar
Now use the following commands to make composer available for all users in your system, which can be used for all php applications on that system.
# mv composer.phar /usr/local/bin/composer
# chmod +x /usr/local/bin/composer
You can also check the version of composer by running bellow command:
# composer -V
Composer version 1.0-dev (bc45d9185513575434021527d7756420e9f4b2cf) 2015-05-11 14:49:39
You can clear composer cache using following command:
# composer clear-cache