Packagist 是 PHP 包管理软件 Composer 的源。本镜像仅包含所有包的 metadata，并非全量同步镜像。

使用方法

全局设置

composer config -g repo.packagist composer https://packagist.mirrors.sjtug.sjtu.edu.cn

或者仅对一个项目设置

composer config repo.packagist composer https://packagist.mirrors.sjtug.sjtu.edu.cn