首先自定義匯出，我用的是一個下拉多選框的一個外掛，百度一下就可找到，為了樣式好看。如圖

value值對應的是你資料庫中查出的欄位值，text對應的是你的表頭資訊。ok，然後我是通過GET把這倆個值傳到我們控制器的。

引入匯出類，這個就不多說。

然後就是查詢資料庫，把資料處理成一個二維陣列，進行迴圈遍歷輸出在表格中

我的資料格式是1對多的關係，一個班主任對應多個班級，那麼我要在表格中合併這個班主任,$count是對班級的統計，當班主任

對應的班級數量>1時，才合併。

            $str=$_GET['str'];//勾選
            $str2=$_GET['str2'];//表頭
            $td_field=explode(',', $str2);//表頭
            $field=explode(',', $str);//勾選
            $objPHPExcel=new \PHPExcel();

            $objPHPExcel->getProperties()->setCreator('http://www.jb51.NET')
                ->setLastModifiedBy('http://www.jb51.Net')
                ->setTitle('Office 2007 XLSX Document')
                ->setSubject('Office 2007 XLSX Document')
                ->setDescription('Document for Office 2007 XLSX, generated using PHP classes.')
                ->setKeywords('office 2007 openxml php')
                ->setCategory('Result file');
            $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue('A1',$td_field[0])
                ->setCellValue('B1',$td_field[1])
                ->setCellValue('C1',$td_field[2])
                ->setCellValue('D1',$td_field[3])
                ->setCellValue('E1',$td_field[4])
                ->setCellValue('F1',$td_field[5])
                ->setCellValue('G1',$td_field[6])
                ->setCellValue('H1',$td_field[7])
                ->setCellValue('I1',$td_field[8])
                ->setCellValue('J1',$td_field[9])
                ->setCellValue('K1',$td_field[10])
                ->setCellValue('L1',$td_field[11])
                ->setCellValue('M1',$td_field[12]);
            $i=2;
            
            //->mergeCells('A18:E22')合併單元格；->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER) 垂直居中
            foreach($new_array as $k=>$v){
                if($v["count"] > 1){

                    $objPHPExcel->setActiveSheetIndex(0)
                    ->setCellValue('A'.$i,$v["$field[0]"])
                    ->setCellValue('B'.$i,$v["$field[1]"])
                    ->setCellValue('C'.$i,$v["$field[2]"])
                    ->setCellValue('D'.$i,$v["$field[3]"])
                    ->setCellValue('E'.$i,$v["$field[4]"])
                    ->setCellValue('F'.$i,$v["$field[5]"])
                    ->setCellValue('G'.$i,$v["$field[6]"])
                    ->setCellValue('H'.$i,$v["$field[7]"])
                    ->setCellValue('I'.$i,$v["$field[8]"])
                    ->setCellValue('J'.$i,$v["$field[9]"])
                    ->setCellValue('K'.$i,$v["$field[10]"])
                    ->setCellValue('L'.$i,$v["$field[11]"])
                    ->setCellValue('M'.$i,$v["$field[12]"])
                    ->mergeCells('A'.$i.':A'.($i+$v["count"]-1))
                    ->mergeCells('B'.$i.':B'.($i+$v["count"]-1))
                    ->mergeCells('C'.$i.':C'.($i+$v["count"]-1))
                    ->mergeCells('D'.$i.':D'.($i+$v["count"]-1))
                    ->mergeCells('E'.$i.':E'.($i+$v["count"]-1))
                    ->mergeCells('F'.$i.':F'.($i+$v["count"]-1))
                    ->mergeCells('G'.$i.':G'.($i+$v["count"]-1))
                    ->mergeCells('H'.$i.':H'.($i+$v["count"]-1))
                    ->mergeCells('I'.$i.':I'.($i+$v["count"]-1));
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('A'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('B'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('C'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('D'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('E'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('F'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('G'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('H'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                    $objPHPExcel->setActiveSheetIndex(0)->getStyle('I'.$i)->getAlignment()->setVertical(\PHPExcel_Style_Alignment::VERTICAL_CENTER);
                }else{
                    $objPHPExcel->setActiveSheetIndex(0)
                    ->setCellValue('A'.$i,$v["$field[0]"])
                    ->setCellValue('B'.$i,$v["$field[1]"])
                    ->setCellValue('C'.$i,$v["$field[2]"])
                    ->setCellValue('D'.$i,$v["$field[3]"])
                    ->setCellValue('E'.$i,$v["$field[4]"])
                    ->setCellValue('F'.$i,$v["$field[5]"])
                    ->setCellValue('G'.$i,$v["$field[6]"])
                    ->setCellValue('H'.$i,$v["$field[7]"])
                    ->setCellValue('I'.$i,$v["$field[8]"])
                    ->setCellValue('J'.$i,$v["$field[9]"])
                    ->setCellValue('K'.$i,$v["$field[10]"])
                    ->setCellValue('L'.$i,$v["$field[11]"])
                    ->setCellValue('M'.$i,$v["$field[12]"]);
                }
                $i++;
            }

            $objPHPExcel->getActiveSheet()->setTitle('日報');
            $objPHPExcel->setActiveSheetIndex(0);
            //$filename=urlencode('資料表').'_'.date('Y-m-dHis');
            $filename='日報'.'_'.date('Y-m-dHis');

       

            //生成xls檔案
            header('Content-Type: application/vnd.ms-excel');
            header('Content-Disposition: attachment;filename="'.$filename.'.xls"');
            header('Cache-Control: max-age=0');
            $objWriter = \PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
            $objWriter->save('php://output');
            exit;