執行 composer update 命令的時候報 Your requirements could not be resolved to an installable set of packages. 錯誤
Your requirements could not be resolved to an installable set of packages.
以上原因：不匹配composer.json要求的版本。
解決方案：
composer可以設置忽略版本匹配，
composer install --ignore-platform-reqs composer update --ignore-platform-reqs
再次執行composer命令可以正常安裝包了。
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