/** * @param WorkbookInterface $workbook The parent Workbook where the Sheet will live * @param PHPExcel_Worksheet $phpExcelWorksheet */ public function __construct(Workbook $workbook, PHPExcel_Worksheet $phpExcelWorksheet = null) { $this->phpExcelWorksheet = $phpExcelWorksheet ?: new PHPExcel_Worksheet($workbook->getRawClass()); }