db_connect.php

<?php
    class DB_CONNECT {
        function __construct() {
            $this->connect();
        }
        function __destruct() {
            $this->close();
        }

        function connect() {
            require_once __DIR__ . '/db_config.php';
            $con = mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());
            $db = mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());
            return $con;
        }

        function close() {
            mysql_close();
        }
    }
?>