composer require经常报php扩展问题(simplexml)

1、安装了扩展重新require还是报没安装，例安装easyswoole/atomic-limit报simplexml扩展没开
apt install php7.4-xml
然后在php.ini打开extension=xml.so 或/etc/php/7.4/cli/conf.d下创建XX-xml.ini里面开启extension=xml.so
开启再安装如果还是报一样的错继续一下操作

composer install --ignore-platform-reqs 
或者     
composer update --ignore-platform-reqs

然后
composer require easyswoole/atomic-limit --ignore-platform-reqs