function export_txt($data)
{   

            Header("Content-type: application/octet-stream"); 
            Header("Accept-Ranges: bytes"); 
            $destination_folder=‘./Public/file/‘;       
            //txt文件  
            $file_name=iconv(‘utf-8‘, ‘gbk‘, ‘账号卡信息‘).date(‘Y-m-d H-i-s‘,time()).‘.txt‘;       
            $destination = $destination_folder.$file_name; //新excel路径
            $fp_write = fopen($destination,"w");
            chmod($destination,0777);
            
            $row = "序号\t卡号\t卡密码\t生成日期\t有效期(天)\t充值期限\t金额\r\n";
            fwrite($fp_write,$row);
            $i=1;
            foreach ($data as $key => $value) { 
                  $row = "$i\t{$value[‘cardnum‘]}\t{$value[‘cardpwd‘]}\t{$value[‘createtime‘]}\t{$value[‘validityday‘]}\t".date(‘Y-m-d‘,$value[‘expirydate‘])."\t{$value[‘money‘]}\r\n"; 
                  fwrite($fp_write,$row);
                  //echo $row;
                  $i++;
            }  
                   
            fclose($fp_write);        
            $file_sub_path="./Public/file/";
            $file_path=$file_sub_path.$file_name; 
            $fp=fopen($file_path,"r"); 
            $file_size=filesize($file_path);
            //下载文件需要用到的头        
            $useragent = $_SERVER[‘HTTP_USER_AGENT‘];
            // echo $useragent;
            // 输出 Content-Disposition时候比较恶心的  还要区分大小写

             if(strstr($useragent,"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0)")){

                  $dis="Content-Disposition:attachment;filename=‘".$file_name."‘";

               }else
               {
                  $dis=‘Content-Disposition:attachment;filename="‘.$file_name.‘"‘;
               }

            Header($dis);  
            Header("Accept-Length:".$file_size); 
            $buffer=1024; 
            $file_count=0; 
            while(!feof($fp) && $file_count<$file_size){ 
                $file_con=fread($fp,$buffer); 
                $file_count+=$buffer; 
                echo $file_con; 
            } 
            fclose($fp);   
            exit();
}