PHP with MySQL 8.0+ error: The server requested authentication method unknown to the client

I'm running MySQL version 8 on PHP 7.0. I'm getting the following error when I try to connect to my database from PHP: > Connect Error: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client PHP might show this error > Warning: mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password] in D:\xampp\htdocs\reg\server.php on line 10 How can I fix this problem?