相信很多phper们在使用composer添加新插件的时候，会碰到这个问题：”明明这次要安装的是一个新插件，结果提示其他插件安装报错“。
类似的报错如：

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

Problem 1
    - phpoffice/phpspreadsheet is locked to version 1.7.0 and an update of this package was not requested.
    - phpoffice/phpspreadsheet 1.7.0 requires ext-zip * -> it is missing from your system. Install or enable PHP's zip extension.
  Problem 2
    - topthink/think-installer v2.0.0 requires composer-plugin-api ^1.0 -> found composer-plugin-api[2.1.0] but it does not match the constraint.
    - topthink/framework v5.1.23 requires topthink/think-installer 2.* -> satisfiable by topthink/think-installer[v2.0.0].
    - topthink/framework is locked to version v5.1.23 and an update of this package was not requested.

其实要解决这个问题很简单，只需要执行一下代码：

composer install --ignore-platform-reqs

composer update --ignore-platform-reqs

忽略掉composer的版本匹配，这样就可以继续正常安装新的包了，快去试试吧

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