function __construct( $xls_fname = null ) {
if ( is_string( $xls_fname ) ) {
# create special "default" format key/val to avoid extra "if" logic:
self::$format = array( 'null' => null );
self::$wb = new Spreadsheet_Excel_Writer_Workbook( $xls_fname );
self::$wb->setVersion( 8 );
self::$ws = self::$wb->addworksheet();
self::$ws->setInputEncoding( 'utf-8' );
self::$ws->setPaper( 9 );
}
}
