Custom Configuration File For Application

[eluser]saidbakr[/eluser]
Hello,
I tried to make custom configuration file in application/config folder and then add it to autoload but it failed to globally propagate its values to the application. Typically I did the following two try:

1- Create a file called config1.php in the config folder and the following is its code:

Code:

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/*
* Custom Configurations:
*/
$config['fox_entry_words_count'] = 50;

The application returns an error message tell that the variable config is undefined.

2- I created the same file but I defined new array for cofiguartion and I called it config1. In this case the whole application is stopped and returned a message tell the following:

Your config1.php file does not appear to contain a valid configuration array.

How could I able to do custom configurations and what's its rules to be globbaly loaded. By the way, I loaded it in autoload.php
$autoload['config'] = array('config1');