1.composer配置阿里云镜像
所有项目都会使用该镜像
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
取消镜像
composer config -g --unset repos.packagist
2.将composer版本升级到最新
composer self-update
3.执行诊断命令
composer diagnose
4.清除composer缓存
composer clear
5.项目通过其它源安装，更新composer.lock文件
composer update --lock
附赠：composer配置中国镜像地址
composer config -g repo.packagist composer https://packagist.phpcomposer.com
取消中国镜像
composer config -g repo.packagist composer https://packagist.org
author：赵锐庆