PHP Fatal error: Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.4.0". You are running 7.3.4.
解决办法
1、项目下composer.json 中 config 配置 添加 "platform-check": false
"config": { "platform-check": false},
2、在项目目录下再执行composer命令:“composer dump”
来源地址:https://blog.csdn.net/my476530/article/details/125259541