Fast and dirty PHP db connect

db.php

<?php
  $mysql_hostname = "hostname";
  $mysql_user = "username";
  $mysql_password = "password";
  $mysql_database = "database";
  $bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password)
    or die("Connection error");
  mysql_select_db($mysql_database, $bd) or die("DB selection error");
?>