<?php
error_reporting(E_ALL);
ini_set('display_errors', '0');
define(XenForo, 'YOURPATH');
require_once('../../forum/library/XenForo/Autoloader.php');
XenForo_Autoloader::getInstance()->setupAutoloader(XenForo.'/library');

XenForo_Application::initialize(XenForo.'/library', XenForo);
XenForo_Application::set('page_start_time', TIMENOW);
XenForo_Application::disablePhpErrorHandler();
XenForo_Application::setDebugMode(false);

restore_error_handler();
restore_exception_handler();

    /**
     * Inserts (or updates an existing) user group change set.
     *
     * @param integer $userId
     * @param string||array $group
     *
     * @return boolean True on change success
     */
    function okb3_promote_user($user, $group){
        $xfDependencies = new XenForo_Dependencies_Public();
        $xfDependencies->preLoadData();

            $userModel = XenForo_Model::create('XenForo_Model_User');
            $userid = $userModel->getUsersByNames($user);
            $result = call_user_func_array('array_merge', $userid);
            $uuserid = $result['user_id'];
            $success = $userModel->addUserGroupChange($uuserid, 'okb3'.$uuserid, $group);

        return $success;
    }

    /**
     * Demotes a user (removes them from the promotion).
     *
     * @param integer $userId
     * @param string||array $group
     */
    function okb3_demote_user($user, $group){
        $xfDependencies = new XenForo_Dependencies_Public();
        $xfDependencies->preLoadData();

            $userModel = XenForo_Model::create('XenForo_Model_User');
            $userid = $userModel->getUsersByNames($user);
            $result = call_user_func_array('array_merge', $userid);
            $uuserid = $result['user_id'];
            $success = $userModel->removeUserGroupChange($uuserid, 'okb3'.$uuserid);

        return $success;
    }

$token = "FillThisIn";
$getmd5 = $_POST['token'];
$mode = $_POST['m'];
$user = $_POST['user']; //This has to be the NAME of the user not ID
$group = $_POST['group']; //This has to be the ID of the group not the NAME

if($getmd5 != "" && $mode != ""){
    if($getmd5 == md5($token)){
        if($mode == 'promote' && okb3_promote_user($user, $group) == 1){
            echo 1;
        }elseif($mode == 'demote' && okb3_demote_user($user, $group) == 2){
            echo 2;
        }
    }else{
        print('Failed;');
    }
}
?>