Horde_Imap_Client_Data_Fetch::_getHeaders PHP Method

    protected function _getHeaders($id, $format, $key)
    {
        switch ($format) {
            case self::HEADER_STREAM:
                if (!isset($this->_data[$key][$id])) {
                    $data = null;
                } elseif (is_object($this->_data[$key][$id])) {
                    switch ($key) {
                        case Horde_Imap_Client::FETCH_HEADERS:
                            $data = $this->_getHeaders($id, 0, $key);
                            break;
                        case Horde_Imap_Client::FETCH_HEADERTEXT:
                        case Horde_Imap_Client::FETCH_MIMEHEADER:
                            $data = $this->_data[$key][$id];
                            break;
                    }
                } else {
                    $data = $this->_data[$key][$id];
                }
                return $this->_msgText(true, $data);
            case self::HEADER_PARSE:
                if (!isset($this->_data[$key][$id])) {
                    return new Horde_Mime_Headers();
                } elseif (is_object($this->_data[$key][$id])) {
                    switch ($key) {
                        case Horde_Imap_Client::FETCH_HEADERS:
                            return clone $this->_data[$key][$id];
                        case Horde_Imap_Client::FETCH_HEADERTEXT:
                        case Horde_Imap_Client::FETCH_MIMEHEADER:
                            $hdrs = $this->_data[$key][$id];
                            break;
                    }
                } else {
                    $hdrs = $this->_getHeaders($id, self::HEADER_STREAM, $key);
                }
                return Horde_Mime_Headers::parseHeaders($hdrs);
        }
        if (!isset($this->_data[$key][$id])) {
            return '';
        }
        if (is_object($this->_data[$key][$id])) {
            switch ($key) {
                case Horde_Imap_Client::FETCH_HEADERS:
                    return $this->_data[$key][$id]->toString(array('nowrap' => true));
                case Horde_Imap_Client::FETCH_HEADERTEXT:
                case Horde_Imap_Client::FETCH_MIMEHEADER:
                    return strval($this->_data[$key][$id]);
            }
        }
        return $this->_msgText(false, $this->_data[$key][$id]);
    }