Gagal connect mysql

Ada yang tau solusinya?

kode program:

<?php

$link = mysqli_connect("localhost", "root", "", "test");
if($link) echo "berhasil";
else echo "gagal";

 ?>

error:

Warning: mysqli_connect(): Unexpected server respose while doing caching_sha2 auth: 21 in C:\MAMP\htdocs\belajar php\index.php on line 3

Warning: mysqli_connect(): MySQL server has gone away in C:\MAMP\htdocs\belajar php\index.php on line 3

Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in C:\MAMP\htdocs\belajar php\index.php on line 3
gagal