messenger::headers PHP Method

    function headers($headers)
    {
        $this->extra_headers[] = trim($headers);
    }

    function main($id, $mode)
    {
        global $config, $phpbb_root_path, $phpEx;
        global $db, $user, $auth, $template;
        $user_id = request_var('u', 0);
        $key = request_var('k', '');
        $sql = 'SELECT user_id, username, user_type, user_email, user_newpasswd, user_lang, user_notify_type, user_actkey, user_inactive_reason
			FROM ' . USERS_TABLE . "\n\t\t\tWHERE user_id = {$user_id}";
        $result = $db->sql_query($sql);
        $user_row = $db->sql_fetchrow($result);
        $db->sql_freeresult($result);
        if (!$user_row) {
            trigger_error('NO_USER');
        }
        if ($user_row['user_type'] != USER_INACTIVE && !$user_row['user_newpasswd']) {
            meta_refresh(3, append_sid("{$phpbb_root_path}index.{$phpEx}"));
            trigger_error('ALREADY_ACTIVATED');
        }
        if ($user_row['user_inactive_reason'] == INACTIVE_MANUAL || $user_row['user_actkey'] != $key) {
            trigger_error('WRONG_ACTIVATION');
        }
        $update_password = $user_row['user_newpasswd'] ? true : false;
        if ($update_password) {
            $sql_ary = array('user_actkey' => '', 'user_password' => $user_row['user_newpasswd'], 'user_newpasswd' => '', 'user_pass_convert' => 0, 'user_login_attempts' => 0);
            $sql = 'UPDATE ' . USERS_TABLE . '
				SET ' . $db->sql_build_array('UPDATE', $sql_ary) . '
				WHERE user_id = ' . $user_row['user_id'];
            $db->sql_query($sql);
        }
        if (!$update_password) {
            include_once $phpbb_root_path . 'includes/functions_user.' . $phpEx;
            user_active_flip('activate', $user_row['user_id']);
            $sql = 'UPDATE ' . USERS_TABLE . "\n\t\t\t\tSET user_actkey = ''\n\t\t\t\tWHERE user_id = {$user_row['user_id']}";
            $db->sql_query($sql);
        }
        if ($config['require_activation'] == USER_ACTIVATION_ADMIN && !$update_password) {
            include_once $phpbb_root_path . 'includes/functions_messenger.' . $phpEx;
            $messenger = new messenger(false);
            $messenger->template('admin_welcome_activated', $user_row['user_lang']);
            $messenger->to($user_row['user_email'], $user_row['username']);
            $messenger->headers('X-AntiAbuse: Board servername - ' . $config['server_name']);
            $messenger->headers('X-AntiAbuse: User_id - ' . $user->data['user_id']);
            $messenger->headers('X-AntiAbuse: Username - ' . $user->data['username']);
            $messenger->headers('X-AntiAbuse: User IP - ' . $user->ip);
            $messenger->assign_vars(array('USERNAME' => htmlspecialchars_decode($user_row['username'])));
            $messenger->send($user_row['user_notify_type']);
            $message = 'ACCOUNT_ACTIVE_ADMIN';
        } else {
            if (!$update_password) {
                $message = $user_row['user_inactive_reason'] == INACTIVE_PROFILE ? 'ACCOUNT_ACTIVE_PROFILE' : 'ACCOUNT_ACTIVE';
            } else {
                $message = 'PASSWORD_ACTIVATED';
            }
        }
        meta_refresh(3, append_sid("{$phpbb_root_path}index.{$phpEx}"));
        trigger_error($user->lang[$message]);
    }