全局配置
#应用到所有项目
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
#取消配置
composer config -g --unset repos.packagist
项目配置
#仅应用当前项目
composer config repo.packagist composer https://mirrors.aliyun.com/composer/
#取消配置
composer config --unset repos.packagist
调试
composer -vvv
有问题
#更新升级
composer self-update
#诊断
composer diagnose
#清除缓存
composer clear
#其它源安装，更新composer.lock文件
composer update --lock