linux 环境，PHP连接MYSQL不上，用localhost可以，但是用127.0.0.1连接不上，是什么原因？ host改为localhost可以连接，用127.0.0.1就连接不上了。

With the release of the Windows 10 Insider build 18945, the Windows Subsystem for Linux version 2 now supports the ability for Windows 10 applications to connect to WSL2 apps via localhost. When WSL2 ...