会话 Codeigniter 中未设置数据

Question

//uploading product movie or image?
        if($this->input->post('upload_360') == "Upload") {
            $config['upload_path'] = './media/images/products/360s';
            $config['allowed_types'] = 'swf';
            $this->load->library('upload', $config);
            $this->upload->initialize($config);
            if (!$this->upload->do_upload('film')) {
                $this->data['product_error'] = $this->upload->display_errors();
                $this->template->build('/admin/products/create', $this->data);
            } else {
                $this->data['data_360'] = $this->upload->data();
                $this->session->set_userdata(array('360_film' => $this->data['data_360']));
                $this->template->build('/admin/products/create', $this->data);
            }
            $this->session->set_userdata(array('advantages' => $this->input->post('product_advantages')));
            $this->data['session_advantages'] = $this->session->userdata('advantages');
        }
        //upload the product image, if successful the user will be
        //notified if the image is too high or wide, and will be offered,
        //the chance to crop the image. All cropping takes place in the media
        //controller.
        if($this->input->post('product_image') == "Upload") {
            $config['upload_path'] = './media/images/products/';
            $config['allowed_types'] = 'gif|jpg|jpeg|png';
            $this->load->library('upload', $config);
            $this->upload->initialize($config);
            if (!$this->upload->do_upload('image_upload')) {
                //die("!");
                $this->data['image_error'] = $this->upload->display_errors();
                $this->template->build('/admin/products/create', $this->data);
            } else {
                $this->data['image_data'] = $this->upload->data();
                $this->session->set_userdata(array('image' => $this->data['image_data']));
                $this->data['session_image'] = $this->session->userdata('image');
                $this->template->build('/admin/products/create', $this->data);
            }
            $this->session->set_userdata(array('advantages' => $this->input->post('product_advantages')));
            $this->data['session_advantages'] = $this->session->userdata('advantages');
        }

        if($this->input->post('screenshot_upload') == "Upload") {
            $config['upload_path'] = './media/images/products/360s/screenshots/';
            $config['allowed_types'] = 'gif|jpg|jpeg|png';
            $this->load->library('upload', $config);
            $this->upload->initialize($config);
            if (!$this->upload->do_upload('screenshot')) {
                //die("!");
                $this->data['screenshot_error'] = $this->upload->display_errors();
                $this->template->build('/admin/products/create', $this->data);
            } else {
                $this->data['screenshot_data'] = $this->upload->data();
                $this->session->set_userdata(array('screenshot' => $this->data['screenshot_data']));
                $this->data['session_screenshot'] = $this->session->userdata('screenshot');
                $this->template->build('/admin/products/create', $this->data);
            }
            $this->session->set_userdata(array('advantages' => $this->input->post('product_advantages')));
            $this->data['session_advantages'] = $this->session->userdata('advantages');
        }

在我的表单上，我让用户选择一个文件，然后单击上传按钮，具体取决于单击哪个按钮，文件将被上传，上传数据将保存在会话中。

然后，该会话用于获取数据以保存到数据库，upload_360 会话可以工作，product_image 会话可以正常工作，但 Screenshot_upload 会话只有在使用 if 语句（代码中的第三个）时才有数据（如果我尝试访问它）在代码之外，那么会话的那部分是空的？

这是有原因的吗？

Answer 1

为什么在将数据插入数据库之前将数据存储在会话中？

Cookie 只能保存 4KB 的数据...

但是，screenshot_upload 会话仅在使用 if 语句（代码中的第三个）时才有数据，如果我尝试在代码之外访问它，那么会话的该部分是空的？

我不明白你问题的那部分。您的意思是仅在使用第三个 if 语句时才具有数据吗？即仅尝试执行 screenshot_upload 而不是 product_image 或 360_upload` 时？如果是这样，则可能涉及 cookie 大小限制。

而不是

$this->session->set_userdata(array('screenshot' => $this->data['screenshot_data']));
$this->data['session_screenshot'] = $this->session->userdata('screenshot');

你为什么不呢

$this->uploads_model->insert_screenshot_data($this->data['screenshot_data']);//send screenshot upload_data to model to be inserted into db
$this->data['screenshot_data'] = $this->data['screenshot_data'];//if you want to pass screenshot upload_data to template/view

？

Answer 2

看起来您在设置会话之前向用户发送输出（我从 $this->template->build 推断出这一点，这是自定义代码。）

会话与标头一样，在任何操作之后都无法修改（任何内容）已发送到输出。这是因为会话本身是在标头中发送的。