好几次遇到阿里云的镜像更新有问题了，明明某个库有了最新版，但阿里云就是报版本不存在。今天又出现了这样的情况，安装laravel-zero的时候，require-dev中有个laravel/pint ^1.2，直接就报了
Problem 1
- Root composer.json requires laravel/pint ^1.2, found laravel/pint[dev-main, v0.1.0, ..., v0.2.4, v1.0.0, ..., v1.1.3] but it does not match the constraint.
问题是这个laravel/pint 的github上，1.2的release是 9月13日啊。（laravel/pint: Laravel Pint is an opinionated PHP code style fixer for minimalists. (github.com)）。
由于之前也遇到过这个问题，当时是unset掉 aliyun镜像，换成了官方镜像，但确实是慢，所以我就看了一眼其他镜像，比如以前常用的https://packagist.phpcomposer.com，在国内没有其他镜像的时候，它做了很大的贡献，然而也太不稳定了。直接报：
Problem 1 - Root composer.json requires laravel-zero/framework, it could not be found in any version, there may be a typo in the package name. Problem 2 - Root composer.json requires nunomaduro/termwind, it could not be found in any version, there may be a typo in the package name. Problem 3 - Root composer.json requires laravel/pint, it could not be found in any version, there may be a typo in the package name. Problem 4 - Root composer.json requires mockery/mockery, it could not be found in any version, there may be a typo in the package name. Problem 5 - Root composer.json requires pestphp/pest, it could not be found in any version, there may be a typo in the package name. Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details. - It's a private package and you forgot to add a custom repository to find it Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.
看来，已经多年没有更新过了，真可惜了。
最后在这里找到了：国内 PHP Composer 镜像列表 - 腾讯云开发者社区-腾讯云 (tencent.com)，列表中的那些镜像，象最后的安畅网络的，网址都崩了。所幸，腾讯的还能用。
打开：腾讯软件源 (tencent.com)，搜到composer，看一下帮助（真简单就两句话），一句教你配置，一句教你下载。
配好之后，composer u，完成。记录一下
1、阿里：composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
2、腾讯：composer config -g repos.packagist composer https://mirrors.tencent.com/composer/
3、清除：composer config -g --unset repos.packagist
3、清除：composer config -g --unset repos.packagist
带 -g 的是全局的，不带 -g，就是当前项目了。