composer 1.9.3 升级到 2.1.8 报错处理

Your requirements could not be resolved to an installable set of packages.

网络处理方式

composer install --ignore-platform-reqs

composer update --ignore-platform-reqs

无效

Root composer.json requires topthink/framework, it could not be found in any version, there may be a typo in the package name.

默认包来源地址为国内镜像 https://packagist.phpcomposer.com

查询 composer config -l -g

执行命令： composer config -g repo.packagist composer https://packagist.org

而后composer install完美成功。