Composer install 时候报错：
Composer update 时候报错：
Your requirements could not be resolved to an installable set of packages
Problem 1
Root composer json requires topthink/framework 5 1.*, found topthink/framework [v5. 1. 41] in the lock file but not in remote repositories, make sure you av d updating this package to keep the one from the lock file
解决方案一：
composer update --ignore-platform-regs
使用强制安装更新
解决方案二：
更换composer镜像地址；
使用：
"repositories": {
"packagist": {
"type": "composer",
"url": "https://packagist.phpcomposer.com"
}
}
或者：
"repositories": {
"packagist": {
"type": "composer",
"url": "https://packagist.org"
}
}
切换 镜像地址后一般可以解决这个问题；
其他问题 ：
出现The "topthink/think-installer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.1.0")
解决步骤：
①清除composer之前的镜像：composer config -g --unset repos.packagist
②更新thinkPHP版本：composer update topthink/framework --no-plugins
③重新安装插件：composer update
其他解决方案：
① 切换项目文件夹
② 运行：composer config -g repo.packagist composer https://packagist.org
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