Configuration Code for MySql In php

<?php
// db constants
defined('DB_SERVER') ? NULL : define("DB_SERVER", 'localhost');
defined('DB_USER') ? NULL : define("DB_USER", 'root');
defined('DB_PASS') ? NULL : define("DB_PASS", '');
defined('DB_NAME') ? NULL : define("DB_NAME", 'DataBase Name');
 ?>