安装

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

包的来源

VCS（线上版本控制系统）

composer.json

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

Packagist

Packagist 是 Composer 主要的一个包信息存储库，对于已发布到Packagist的包，安装更方便

composer require monolog/monolog

或者

composer.json

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

参考

https://docs.phpcomposer.com/02-libraries.html