Question

我想从数据库下载文件，但我有条件。每个文件都有唯一的request_id，即来自表格。以下代码是从上一个request_id下载的文件。例如，当我点击来自不同request_id的下载按钮时，它就像这样（在下载历史记录中）：

excel3.xlsx
excel3（1）的.xlsx
excel3（2）的.xlsx

应该是：

excel1.xlsx
excel2.xlsx
excel3.xlsx

下载的文件是ZERO BYTE。因为没有显示错误，我找不到我的错误。请帮忙......

下载按钮：

<a href="<?php echo site_url('admin/download')?>" download>
  <button id="upload_excel" type="submit" class="btn btn-success" value=<?php echo $value['req']?>>
    <span class="glyphicon glyphicon-envelope" aria-hidden="true" ></span> Download
  </button>

我的控制器：

function download($req)
        {
            $this->load->helper('download');

            $this->load->model('request');
            $data['file'] = $this->request->request($req);
            foreach ($data['file'] as $key) 
            {
                $req_id = $key['req'];
                $data['file'][$req_id] = $key['filename_user'];
                $file = $data['file'][$req_id];

                $download_file = FCPATH.'/kirim_undangan/';//path of the file
                $content_type = mime_content_type($download_file);//mime type of the file
                $file_name = basename($file);//file name based on request_id 
                header("Pragma: public");
                header("Expires: 0");
                header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
                header("Cache-Control: public");
                header("Content-Description: File Transfer");
                header("Content-type: ".$content_type);
                header("Content-Disposition: attachment; filename=\"".$file_name."\"");
                header("Content-Transfer-Encoding: binary");
                header("Content-Length: ".filesize($download_file));

                    while (ob_get_level()) {
                       ob_end_clean();
                    }
                readfile($download_file);
            }
        }

我的模特：

function request()
    {

        $this->db->select("request_Id as req, email as email, name as nama, phone as phone, address as alamat_pengirim, filename_user, filename_admin");
        $this->db->where('status < 3');
        $query  =   $this->db->get('request');
        return $query->result_array();
    }

将php值传递给href标签html

0 个答案: