PHP 的一个依赖管理工具 - Composer

curl -sfL https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer

{
    "repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/username/hello-world"
        }
    ],
    "require": {
        "acme/hello-world": "dev-master"
    }
}

composer require monolog/monolog

{
    "require": {
        "monolog/monolog": "1.0.*"
    }
}