phpexcel使用的问题

if ($ext =='xlsx') {
                $inputFileType = 'Excel2007';
//                $objReader = \PHPExcel_IOFactory::createReader($inputFileType);
                $objReader = new \PHPExcel_Reader_Excel2007();
                $objReader->setReadDataOnly(true);
                $objPHPExcel = $objReader->load($filename);

            } else if ($ext =='xls') {
                $inputFileType = 'Excel5';
//                $objReader = \PHPExcel_IOFactory::createReader($inputFileType);
                $objReader = new \PHPExcel_Reader_Excel5();
                $objReader->setReadDataOnly(true);
                $objPHPExcel = $objReader->load($filename);
            } else if ($ext=='csv') {
                $objReader = \PHPExcel_IOFactory::createReader('CSV')
                    ->setDelimiter(',')
                    ->setInputEncoding('UTF-8//IGNORE')
                    ->setEnclosure('"')
                    ->setSheetIndex(0);
                $objPHPExcel = $objReader->load($filename);
            }
            ob_clean();
            $sheetData = $objPHPExcel->getActiveSheet()->toArray(null,true,true,true);