Php Mysql database Connection

<?php

// localhost    -  localhost   or  ip address
// user           -  database username
// password   -  database password
// database    - database name

$mysql = mysql_connect("localhost", "user","password") or die("Could not connect to MySql :" . mysql_error());

$db = mysql_select_db("database") or die("Unable to select database : " . mysql_error());

?>