function addFormat($properties = array())
    {
        $format = new Spreadsheet_Excel_Writer_Format($this->_BIFF_version, $this->_xf_index, $properties);
        $this->_xf_index += 1;
        $this->_formats[] = $format;
        return $format;
    }
function addFormat($properties = array())
    {
        $format = new Spreadsheet_Excel_Writer_Format($this->_BIFF_version, $this->_xf_index, $properties);
        $this->_xf_index += 1;
        $this->_formats[] = $format;
        return $format;
    }
function addFormat ( $ properties = array ( ) ) { $ format = new Spreadsheet_Excel_Writer_Format ( $ this -> _BIFF_version , $ this -> _xf_index , $ properties ) ; $ this -> _xf_index += 1 ; $ this -> _formats [ ] = $ format ; return $ format ; }
Add a new format to the Excel workbook.
Also, pass any properties to the Format constructor.

@access public
@param array $properties array with properties for initializing the format.
@return &Spreadsheet_Excel_Writer_Format reference to an Excel Format
Add a new format to the Excel workbook . Also pass any properties to the Format constructor .