<?php
$servername = "localhost";
$username = "username";
$password = "password";

// Create connection
$conn = new mysqli($servername, $username, $password);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$id = mysqli_real_escape_string($conn, $_GET['Userid']);

$sql = "SELECT `name` FROM `rusttestet` WHERE `id` = $id LIMIT 1"

$result = $conn->query($sql);

if(mysqli_num_rows($result))
{
    $row = mysqli_num_rows($result);
    $name = $row['name'];
    echo 'Hello ' . $name;
}
?>