Composer遇到问题：Your requirements could not be resolved to an installable set of packages.

执行composer install或composer require的时候遇到

类似以上代码的报错时
用以下代码即可解决问题

composer install --ignore-platform-reqs

或者 composer update --ignore-platform-reqs

或者 composer require **** --ignore-platform-reqs

来源：oschina

链接：https://my.oschina.net/u/3389750/blog/4505723