Composer is a dependency management tool for your PHP projects.
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Install PHP5 CLI
$ sudo apt-get install php5-cli
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Get the Composer installer
$ curl -sS https://getcomposer.org/installer | php
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Move to a global directory so that all projects can simply use the
composer install
commands$ sudo mv composer.phar /usr/local/bin/composer
To install dependencies, first go to the project folder
$ cd /var/www/project
$ composer install
For existing projects with updated dependencies
$ composer update