分片导出加字段

app/Http/Controllers/Admin/StatisticsController.php

                 <th>".iconv("UTF-8", "GB2312//IGNORE","毛利")."</th>              
                 <th>".iconv("UTF-8", "GB2312//IGNORE","当日新粉成单率")."</th>              
                 <th>".iconv("UTF-8", "GB2312//IGNORE","综合成单率")."</th>              
+                <th>".iconv("UTF-8", "GB2312//IGNORE","复购率")."</th>              
+                <th>".iconv("UTF-8", "GB2312//IGNORE","综合ROI")."</th>              
+                <th>".iconv("UTF-8", "GB2312//IGNORE","新粉ROI")."</th>              
 
             </tr>";
 
                 $fugou_order_count_no = $order->order_count - $fugou->order_count;
                 $v['fugou_rate'] = $fugou_order_count_no>0 ? round($fugou->order_count / $fugou_order_count_no, 4) * 100 .'%' : '';
 
+                //加roi
+                $v['total_roi'] = $v['total_cost']>0 ? round($v['order_amount'] / $v['total_cost'], 4) * 100 .'%' : '';
+                $v['new_roi'] = $v['total_cost']>0 ? round($v['new_order_amount'] / $v['total_cost'], 4) * 100 .'%' : '';   
+
                 $data_str .= "<tr>";
                 $data_str .= "<td>".$v['dtime']."</td>";
                 $data_str .= "<td>".$v['total_fan_add']."</td>";
                 $data_str .= "<td>".$v['profit']."</td>";
                 $data_str .= "<td>".$v['new_order_rate']."</td>";
                 $data_str .= "<td>".$v['order_rate']."</td>";
+                $data_str .= "<td>".$v['fugou_rate']."</td>";
+                $data_str .= "<td>".$v['total_roi']."</td>";
+                $data_str .= "<td>".$v['new_roi']."</td>";
 
                 $data_str .= "</tr>";
             }