undefined constant DB_SERVER - assumed 'DB_SERVER' - php

Question

I have installed WAMP server on my local machine and I have written php script to insert record into the database, but I'm getting the following error-
Notice: Use of undefined constant DB_SERVER - assumed 'DB_SERVER' in C:\wamp\www\test_services\db_connect.php on line 32
following is my db_config code
<?php 
define('DB_USER', "root"); // db user
define('DB_PASSWORD', ""); // db password
define('DB_DATABASE', "test_db"); // database name
define('DB_SERVER', "localhost"); // db server
?>
Here is my **db_connect.php code**
<?php
/**
* A class file to connect to database
*/
class DB_CONNECT
{
// constructor
function __construct()
{
// connecting to database
$this->connect();
}
// destructor
function __destruct()
{
// closing db connection
$this->close();
}
/**
* Function to connect with database
*/
function connect()
{
// import database connection variables
require_once __DIR__ . '/db_config.php';
// Connecting to mysql database
$con = mysql_connect(DB_SERVER, DB_USER, DB_PASSWORD) or die(mysql_error());
// Selecing database
$db = mysql_select_db(DB_DATABASE) or die(mysql_error()) or die(mysql_error());
// returing connection cursor
return $con;
}
/**
* Function to close db connection
*/
function close()
{
// closing db connection
mysql_close();
}
}
?>
Please help.. Thank you..!

Answer 1

I don't think you are showing the correct file. The problem is in db_connect.php. It is very likely that that file does not include db_config.php, i.e:
require_once 'path/to/db_config.php';
Edit: Does db_config.php actually live in the same directory as db_connect.php? Your code suggests that it does, which may be incorrect?
Edit: What happens if you put $var = 'hello' in db_config.php, and then print $var in db_connect.php after you include it, do you see 'hello'? Just to clarify you are connecting with the file..