Integrating with PHPBB

[eluser]Little_Match_Girl[/eluser]
My current project is, I must to integrating my Application's User System with phpBB's User System.

I've got a PHP Classes to do that. (I was get it from PHPClasses org).
The class is need to include the PHPBB's common.php file.


/***********************************************************************/


I have The PHPBB's directory outside the CodeIgniter application.
Here's the directory path :

*my controller path :

Code:

[ app root ] /system/application/controllers/coba_phpbb.php

*the common.php file, that's need to be included in coba_phpbb controller :

Code:

[ app root ] /phpbb/common.php

/***********************************************************************/


I had been trying to including it with this statement :

Code:

require_once($phpbb_root_path .'common.php');

where the value is :

Code:

$phpbb_root_path = "../../../phpbb/";

but it's not work, the file is not found;


/***********************************************************************/


Then I tried this path :

Code:

$phpbb_root_path = "http://" .$_SERVER['HTTP_HOST'] ."/ [ app root ] /phpBB3/"

and it was doesn't work either.
The CodeIgniter output was :
/***********************************************************************/

A PHP Error was encountered

Severity: Warning

Message: phpbb::require_once() [phpbb.require-once]: URL file-access is disabled in the server configuration

Filename: controllers/example_phpbb.php

/***********************************************************************/


Is anybody know how to solve this problem ?