我试图连接到mysql服务器使用php，但它给出了以下错误

Connection failed: The server requested authentication method unknown to the client

mysql服务器版本为8.0.12，php版本为7.2.9。我的代码连接到mysql服务器

<?php
$servername = "127.0.0.1";
$username = "root";
$password = "mypassword";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
echo "Connected successfully";
?>

这个问题以前在这里被问过，但解决方案不适合我，所以我再次问这个问题。谢谢
编辑：我现在重新安装了php，它为相同的代码提供了以下内容

This page isn’t working
127.0.0.1 is currently unable to handle this request.
HTTP ERROR 500