public static function run($dataDir = null) { # Instantiating a Workbook object $workbook = new Workbook(); # Adding Page Breaks ManagingPageBreaks::add_page_breaks($dataDir = null, $workbook); # Clearing All Page Breaks ManagingPageBreaks::clear_all_page_breaks($dataDir = null, $workbook); # Removing Specific Page Break ManagingPageBreaks::remove_page_break($dataDir = null, $workbook); }