how to make config file

 http://www.hotscripts.com/category/php/

<?php  $dbHost = 'localhost';
    $dbUser = 'root';
    $dbPass = '';
    $dbName = 'vedemo1';
    $con = mysql_connect($dbHost, $dbUser, $dbPass, $dbName);
    mysql_select_db("vedemo1",$con);  
?>