php导出csv格式数据,以及将数字转换成文本解决办法

php导出csv格式数据实现：
先定义一个字符串 存储内容，例如
 $exportdata = '规则111,规则222,审222,规222,服2222,规则1,规则2,规则3,匹配字符,设置时间,有效期'." ";

然后对需要保存csv的数组进行foreach循环，例如

              if (!empty($lists)){
                  foreach($lists as $key => $value){
                    $time = date("Y-m-d_H:i:s", $value['add_time']);
                    $exportdata .= "" ".$value['Rule_id'].""," ".$value['Rule_name'].""," ".$value['Matching_level'].""," "."{$value['Rule_action']}".""," ".$value['Service_type'].""," ".$value['Keyword1'].""," ".$value['Keyword2'].""," ".$value['Keyword3'].""," ".$value['Matching_word'].""," ".$value['Set_time'].""," ".$value['Validation_time']."" ";
                  }
              }

csv格式的内容用','隔开，在现实的时候就能分格了。每一行后面就一个' '就能分行了。

然后在后面执行输出就行了。例如

              $filename = "plcnetinfo_{$date}.csv";
            
              header("Content-type:application/vnd.ms-excel");
              header("Content-Disposition: attachment; filename=$filename");

              header("Expires: 0");
              header("Pragma: public");
              header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
              header("Cache-Control: public");
     
              echo(mb_convert_encoding($exportdata,"gb2312","UTF-8"));

但是在导出数字的时候csv就会把前面的0去掉，例如 我想显示 00001   ，如果输出的话就会显示1.这种解决办法就是在输出的时候就一个'" ',这个是制表符，会显示成空格。就能把数值转化成文本了。不过在导入的时候会出现'"    '.这种东西，用一下php自带的trim函数就好了。完整代码如下：

              //var_dump($sql);
              $lists = $this->dbo->query($sql);

 　　　　  $exportdata = '规则111,规则222,审222,规222,服2222,规则1,规则2,规则3,匹配字符,设置时间,有效期'." ";
              $date = date("YmdHis");
              if (!empty($lists)){
                  foreach($lists as $key => $value){
                    $time = date("Y-m-d_H:i:s", $value['add_time']);
                    $exportdata .= "" ".$value['Rule_id'].""," ".$value['Rule_name'].""," ".$value['Matching_level'].""," "."{$value['Rule_action']}".""," ".$value['Service_type'].""," ".$value['Keyword1'].""," ".$value['Keyword2'].""," ".$value['Keyword3'].""," ".$value['Matching_word'].""," ".$value['Set_time'].""," ".$value['Validation_time']."" ";
                  }
              }
              $filename = "plcnetinfo_{$date}.csv";
            
              header("Content-type:application/vnd.ms-excel");
              header("Content-Disposition: attachment; filename=$filename");

              header("Expires: 0");
              header("Pragma: public");
              header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
              header("Cache-Control: public");
     
              echo(mb_convert_encoding($exportdata,"gb2312","UTF-8"));