PHP code to connect MYSQL database

<?php
$hostname = "localhost";
$user = "user";
$password = "BJx3p2awbuTvdVwS";
$database = "test";
$prefix = "";
$bd = mysql_connect($hostname, $user, $password) or die("Could not connect database");
mysql_select_db($database, $bd) or die("Could not select database");
?>