去除镜像
composer config -g --unset repos.packagist
添加全局镜像
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
为当前项目添加镜像
omposer config repo.packagist composer https://mirrors.aliyun.com/composer/
查看镜像
composer config -l -g
原文：https://www.cnblogs.com/ydl233/p/11412702.html