修改Composer镜像下载地址
查看配置
composer config -l -g # 全局配置
composer config -g repo.packagist # 项目配置
修改配置
镜像地址有：
https://php.cnpkg.org、https://packagist.phpcomposer.com和https://packagist.laravel-china.org等可供选择，这里以php.cnpkg.org配置为例。
- 全局配置
composer config -g repos.packagist composer https://php.cnpkg.org
- 单独项目配置
composer config repo.packagist composer https://php.cnpkg.org
- 关闭全局配置
composer config -g --unset repos.packagist
还原配置
composer config -g repo.packagist composer https://packagist.org