php 의존성 관리자 (PHP 5.3.2+)
[global 설치]
# curl -sS https://getcomposer.org/installer | php
# mv composer.phar /usr/local/bin/composer
# composer --version
[local 설치]
# curl -sS https://getcomposer.org/installer | php
# php [경로]/composer.phar --version
[참고]
https://getcomposer.org/doc/00-intro.md