How to connect server database in PHP

My configuration:
Webserver :- xampp
PHP       :- 7.3.3
OS        :- windows

mysqli::__construct(): (HY000/2002)

$dbServerName = "amazonaws.com";
$dbUsername = "example";
$dbPassword = "*******";
$dbName = "example";

// create connection
$conn = new mysqli($dbServerName, $dbUsername, $dbPassword, $dbName);

// check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";