IMP_Mailbox_List::unseenMessages PHP Method

    public function unseenMessages($results, array $opts = array())
    {
        $count = $results == Horde_Imap_Client::SEARCH_RESULTS_COUNT;
        if (empty($this->_sorted)) {
            return $count ? 0 : array();
        }
        $criteria = new Horde_Imap_Client_Search_Query();
        $imp_imap = $this->_mailbox->imp_imap;
        if ($this->_mailbox->hideDeletedMsgs()) {
            $criteria->flag(Horde_Imap_Client::FLAG_DELETED, false);
        } elseif ($count) {
            try {
                $status_res = $imp_imap->status($this->_mailbox, Horde_Imap_Client::STATUS_UNSEEN);
                return $status_res['unseen'];
            } catch (IMP_Imap_Exception $e) {
                return 0;
            }
        }
        $criteria->flag(Horde_Imap_Client::FLAG_SEEN, false);
        try {
            $res = $imp_imap->search($this->_mailbox, $criteria, array('results' => array($results), 'sequence' => empty($opts['uids']), 'sort' => empty($opts['sort']) ? null : $opts['sort']));
            return $count ? $res['count'] : $res;
        } catch (IMP_Imap_Exception $e) {
            return $count ? 0 : array();
        }
    }