php mysqli_connect: authentication method unknown to the client [caching_sha2_password]
As of PHP 7.4, this is no longer an issue. Support for caching_sha2 authentication method has been added to mysqlnd.
Currently, PHP mysqli extension do not support new caching_sha2 authentication feature.
You have to wait until they release an update.
Check related post from MySQL developers: https://mysqlserverteam.com/upgrading-to-mysql-8-0-default-authentication-plugin-considerations/
They didn't mention PDO, maybe you should try to connect with PDO.
PHP 7.2.2 + mysql 8.0 PDO gives: authentication method unknown to the client [caching_sha2_password]
If you want to use MySQL >= 8 and you don't care about caching_sha2_password, just select the second option when you install.
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