!要看最下面的更新
composer查看全局设置：
composer config -gl
设置composer镜像为国内镜像：
composer config -g repo.packagist composer https://packagist.phpcomposer.com
上面地址前几天崩了，可以用下面这个：
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer
laravel-china由于一些原因,会于8月1日退出历史舞台,坛主给出了解释,以及对应方案,谢谢!
https://learnku.com/articles/30758 阿里镜像:
https://learnku.com/laravel/t/30710 镜像管理器:
https://github.com/slince/composer-registry-manager
laravel学习视频:
https://learnku.com/courses/laravel-package/109-make-validation-rules-reusable-illuminatechvalidation-composite/4909
