Connect to server and select database using php

<?php
if(!mysql_connect('servername','username','password'))
 {
     die('Connection failed!'.mysql_error());
 }
      if(!mysql_select_db("dbname"))
 { 
die('Database unavailable'.mysql_error());
 }
 ?>
------------------------------------------------------------- Note: When we are using XAMPP or WAMP, servername = localhost, username = root, password is empty