$conn = mysql_connect('localhost',  '', '');
        if ($conn) {
            mysql_select_db('');

            $checkUsername = strtolower($nameOrEmail);

            $result = mysql_query("SELECT id, username, sha_pass_hash, email FROM account WHERE username='$checkUsername'") or die(mysql_error());
            $row = mysql_fetch_array($result);

            if (!empty($row['username'])) { // Old user exists
                $oldEncryptedPassword = sha1 ( strtoupper ( $nameOrEmail ) . ':' . strtoupper ( $password ) );

                if ($row['sha_pass_hash'] == $oldEncryptedPassword) { // Password is correct, register on new forum
                    $writer = XenForo_DataWriter::create('XenForo_DataWriter_User');

                    $writer->set('user_group_id', XenForo_Model_User::$defaultRegisteredGroupId);
                    $writer->set('language_id', XenForo_Visitor::getInstance()->get('language_id'));
                }
            }
        }