phpexcelに詳しい方、教えてください。

			for($m_k=0,$column_num0='A';$m_k<$column_max,$column_num0<'ZZ';$column_num0++,$m_k++)			{				//$objectPHPExcel->getActiveSheet()->getColumnDimension($column_num0)->setWidth(10);				//$objectPHPExcel->setActiveSheetIndex(0)->setCellValue($column_num0.'1',$m_arr[$m_k]);				//$objectPHPExcel->getActiveSheet()->getStyle((string)($column_num0.'1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);			}	for($key_num=0;$key_num<$row_max;$key_num++)			{				$row_num=$key_num+2;	//数组的索引是行号-2				$avar_arr=array_filter(explode('|',$data[$key_num]['avar']));				$answer_arr=array_filter(explode('|',$data[$key_num]['aanswer']));				$d_arr=array_combine($avar_arr,$answer_arr);								foreach($d_arr as $k=>$v)				{					foreach($m_arr as $k1=>$v1)					{						if(!isset($d_arr[$v1]))						{							$d_arr[$v1]=' ';						}					}				}				ksort($d_arr);								$d_arr=array_values($d_arr);				for($column_num='A',$column_num2=1;$column_num<'ZZ',$column_num2<301;$column_num++,$column_num2++)				{					foreach($d_arr as $k=>$v)					{						if($k==($column_num2-1))						{				$objectPHPExcel->getActiveSheet()->setCellValue($column_num.$row_num,$v);				$objectPHPExcel->getActiveSheet()->getStyle((string)($column_num.$row_num))->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);						}					}				}			}						header('Content-Type: application/vnd.ms-excel');  			header('Content-Disposition: attachment;filename="'.date('Ymd-His').'.xls"');  			header('Cache-Control: max-age=0');  	  			$objWriter = PHPExcel_IOFactory::createWriter($objectPHPExcel, 'Excel5');  			$objWriter->save('php://output');