MyBB Community Forums

I am trying to make a simple authentication plugin for Dokuwiki to allow forum members to view the wiki but I keep getting an error when I include "global.php".

The wiki is located in a sub-folder named "wiki" in the MyBB root folder. Therefore the plugin ends up in:
"{mybb_root}/wiki/lib/plugins/authmybb/auth.php"

If I create a "test.php" file in the root of my wiki with the following contents:

define("IN_MYBB", 1);

define('MYBB_ROOT_DIR', dirname(dirname(__FILE__))."/");
echo MYBB_ROOT_DIR;
require_once MYBB_ROOT_DIR."global.php";

echo "<pre>";
var_dump($db);
echo "</pre>";

And I access it directly in my browser. The $db object is working properly and the include path is correct.

But if I do the following in my plugin:

if(!defined('DOKU_INC')) die();

define("IN_MYBB", 1);

define('MYBB_ROOT_DIR', dirname(dirname(dirname(dirname(dirname(__FILE__)))))."/");
echo MYBB_ROOT_DIR;
require_once MYBB_ROOT_DIR."global.php";

echo "<pre>";
var_dump($db);
echo "</pre>";

(those nested dirname sure look awkard)

Then the include directory is also correct but instead I get this error:

Fatal error: Call to a member function simple_select() on null in {mybb_root}/inc/class_datacache.php on line 117

MyBB version: 1.8.6
PHP version: 5.6.14

Dokuwiki likely defines $db itself causing conflicts.