Composer常用操作

使用阿里云的composer镜像，可以极大提高速度。原文详见：https://mirrors.aliyun.com/composer/index.html

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/ 
//以上为全局配置

composer config -g --unset repos.packagist
//以上为取消配置

 删除已经安装过的包

composer remove vendor/package
composer update