IMP_Mailbox_List::_buildMailbox PHP Method

    protected function _buildMailbox()
    {
        $cacheid = $this->_mailbox->cacheid;
        if (!is_null($this->_sorted) && $this->_cacheid == $cacheid) {
            return;
        }
        $this->changed = true;
        $this->_cacheid = $cacheid;
        $this->_sorted = array();
        $query_ob = $this->_buildMailboxQuery();
        $sortpref = $this->_mailbox->getSort(true);
        $thread_sort = $sortpref->sortby == Horde_Imap_Client::SORT_THREAD;
        if ($this->_mailbox->access_search && $this->_mailbox->hideDeletedMsgs()) {
            $delete_query = new Horde_Imap_Client_Search_Query();
            $delete_query->flag(Horde_Imap_Client::FLAG_DELETED, false);
            if (is_null($query_ob)) {
                $query_ob = array(strval($this->_mailbox) => $delete_query);
            } else {
                foreach ($query_ob as $val) {
                    $val->andSearch($delete_query);
                }
            }
        }
        if (is_null($query_ob)) {
            $query_ob = array(strval($this->_mailbox) => null);
        }
        if ($thread_sort) {
            $this->_thread = $this->_threadui = array();
        }
        foreach ($query_ob as $mbox => $val) {
            $mbox_ob = IMP_Mailbox::get($mbox);
            if ($thread_sort) {
                $this->_getThread($mbox, $val ? array('search' => $val) : array());
                $sorted = $this->_thread[$mbox]->messageList()->ids;
                if ($sortpref->sortdir) {
                    $sorted = array_reverse($sorted);
                }
            } else {
                try {
                    $res = $mbox_ob->imp_imap->search($mbox, $val, array('sort' => array($sortpref->sortby)));
                } catch (IMP_Imap_Exception $e) {
                    switch ($e->getCode()) {
                        case Horde_Imap_Client_Exception::MAILBOX_NOOPEN:
                            if ($this->_mailbox->search) {
                                /* Ignore non-existent mailboxes when in a search
                                 * mailbox. */
                                continue 2;
                            }
                    }
                    throw $e;
                }
                if ($sortpref->sortdir) {
                    $res['match']->reverse();
                }
                $sorted = $res['match']->ids;
            }
            $this->_sorted = array_merge($this->_sorted, $this->_buildMailboxProcess($mbox_ob, $sorted));
        }
    }