首先参考霹雳神博客：
https://www.pilishen.com/posts/packages-in...

再分享几个Composer / Packagist 中国全量镜像

https://php.cnpkg.org/(每 60 秒同步一次)

composer config -g repos.packagist composer https://php.cnpkg.org
#或者
composer config -g repo.packagist composer  https://mirrors.aliyun.com/composer
#或者
composer config -g repo.packagist composer https://packagist.laravel-china.org

然后清空composer缓存

composer clearcache