A naive model implementation. From the article: PDO for Elegant PHP Database Access, http://www.modernphpbook.com/articles/pdo-for-elegant-php-database-access - Fig 1

UserModel.php

<?php 
class UserModel
{
    public static function connectDb()
    {
        mysql_connect('localhost', 'username', 'password') 
            or die('some error');
        
        mysql_select_db('someDb') 
            or die('could not select db');
    }
    public static function getUser($id)
    {
        $db = self::connectDb();
        $query = 'SELECT * FROM users WHERE id = ' . (int)$id;
        $result = mysql_query($query);
        return mysql_fetch_object($result)
    }
    /* ...etc */
}

ew ugly. have you ever heard of PDO?