Use PHP to authenticate information in a MySQL database from an external server
$conn = mysql_connect('external-server.hostname.example.com', $user, $password);
mysql_select_db($database_name);
	
GRANT SELECT ON databasename.tablename TO `webserveruser`@`webserver-hostname` IDENTIFIED BY 'thepassword';
	
http://www.myhostingservice.com/refer/80ddca50-f41e-11e0-be50-0800200c9a66/
	
<form action="post" method="checklogin.php">
<input type="username" name="username_input" />
<input type="password" name="password_input" />
<input type="submit" value="Validate Login" name="do_validation" />
</form>
	
// Get the form data
if ($_POST['do_validation'])
{
    // The correct form was posted, get the form data
    $username = mysql_real_escape_string($_POST['username_input']);
    $password = mysql_real_escape_string($_POST['password_input']);

    // Connect to the database
    mysql_connect ("http://91.0.0.1", "myUsername", "myPassword");

    // Select database
    mysql_select_db('remote_table_name');

    // Check the username and password against database
    $check_credentials = mysql_query("SELECT user_id FROM users WHERE username='$username' AND password='$password'");

    // Check that user exists
    if (mysql_num_rows($check_credentials) == 1)
    {
        $existing_user = mysql_fetch_assoc($check_credentials);
        $existing_user_id = $existing_user_id['user_id'];

        // The user exists, now get ID of posts from another table, using their 'user_id'
        $check_posts = mysql_query("SELECT post_id FROM posts WHERE user_id='$existing_user_id'");

        // Check the number of posts is at least 100
        if ($check_posts >= 100)
        {
            // The user has 100 posts OR MORE
            echo "You are a valid user";

            // Here you could start a session for the user (logging them in), and then show the data that you want

            session_start();
            // Store the user_id of the user in a SESSION
            $_SESSION['user_id'] = $existing_user_id;
        }
    }
}