默认全局配置

阿里云
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

华为云
composer config -g repo.packagist composer https://mirrors.huaweicloud.com/repository/php/

腾讯云
composer config -g repos.packagist composer https://mirrors.cloud.tencent.com/composer/

phpcomposer Composer官方镜像（速度慢的一匹）
composer config -g repo.packagist composer https://packagist.phpcomposer.com

Packagist 中国全量镜像（由安畅网络赞助）
composer config -g repo.packagist composer https://php.cnpkg.org

Packagist / JP 日本镜像（一个日本开发者搭建的镜像）
composer config -g repo.packagist composer https://packagist.jp/

Packagist Mirror 上海交通大学镜像
composer config -g repo.packagist composer https://packagist.mirrors.sjtug.sjtu.edu.cn/

Packagist 清华大学镜像
composer config -g repo.packagist composer https://mirrors.tuna.tsinghua.edu.cn/composer/

laravel-china （已经停止维护）
composer config -g repos.packagist composer https://packagist.laravel-china.org