IMP_Contents::_getHeader PHP Method

    protected function _getHeader($type, $seen)
    {
        if (!isset($this->_header)) {
            if (!$this->_indices) {
                $this->_header = $this->_message->addMimeHeaders();
            } else {
                $query = new Horde_Imap_Client_Fetch_Query();
                $query->headerText(array('peek' => !$seen));
                $this->_header = ($res = $this->_fetchData($query)) ? $res : new Horde_Imap_Client_Data_Fetch();
            }
        }
        switch ($type) {
            case self::HEADER_OB:
                return $this->_indices ? $this->_header->getHeaderText(0, Horde_Imap_Client_Data_Fetch::HEADER_PARSE) : $this->_header;
            case self::HEADER_TEXT:
                return $this->_indices ? $this->_header->getHeaderText() : $this->_header->toString();
            case self::HEADER_STREAM:
                if ($this->_indices) {
                    return $this->_header->getHeaderText(0, Horde_Imap_Client_Data_Fetch::HEADER_STREAM);
                }
                $stream = new Horde_Support_StringStream($this->_header->toString());
                $stream->fopen();
                return $stream;
        }
    }