在codeigniter中设置图像的提交值

Question

我有一个包含3个字段的表单。

所有3个字段都是必填字段，并具有验证规则。

当我提交表单时，我可以使用set_value();

设置文本字段的提交值

如何设置图像的提交值？

如果我再次提交表格，请让我再次上传图片。

post_plot（查看）

<form method ="post" enctype="multipart/form-data">
<div>
<label>Property Title</label>
<input type="text" name="title" value="<?php echo set_value('Title'); ?>" />
</div>
<div>
<label>Property type</label>
<input type="text" name="type" value="<?php echo set_value('type'); ?>" />
</div>

<div>
<label>File</label>
<input type="file" name="img" value="<?php echo set_value('img'); ?>" />
</div>

<div>

<input type="submit" name="submit" value="submit" />
</div>
</form>

绘图控制器

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Plot extends CI_Controller {


    public function __construct()
    {
        parent::__construct();
        $this->load->library('Admin_layout');
        $this->load->model('admin/plot_model');
        $this->config->load('plot_rules');
        $this->output->enable_profiler(TRUE);
        $this->new_name='';
    }

    public function index()
    {
        if (!$this->auth->loggedin()) {
            redirect('admin/login');
        }
    }


    public function add(){


     $this->form_validation->set_rules($this->config->item('plot_settings'));
     $this->form_validation->set_error_delimiters('<p><b>', '</b></p>');

     $data["plot_attrib"] = $this->config->item("plot_attribute");
     $data["plot_attrib"]['title'] = 'Add Plot';
     $data["plot_attrib"]['action'] = base_url('admin/plot/add');

     $location = $this->plot_model->get_location();
     $property_type = $this->plot_model->get_property_type();

     $data["plot_attrib"]['location_dropdown'] = $location;

     $data["plot_attrib"]['property_dropdown'] = $property_type;
     $data["plot_attrib"]["error"] = ' ' ;

     $add_attributes = $data["plot_attrib"];
    // echo '<pre>'; print_r($add_attributes); echo '</pre>';


      if ($this->form_validation->run('submit') == FALSE ) 
      {

            $this->admin_layout->set_title('Post Plot');  
            $this->admin_layout->view('admin/post_plot',$add_attributes);
      } 
      else {

            $img = "img";   
            $config['upload_path'] = './images/';
            $config['allowed_types'] = 'gif|jpg|png';
            $config['max_size']  = 1024;
            $config['max_width']  = 1024;
            $config['max_height'] = 768;

            $this->new_name = 'plot_'.round(microtime(true));
            $config['file_name'] = $this->new_name;
            $this->load->library('upload', $config);

            if($this->upload->do_upload('img')){


                $data = array('upload_data' => $this->upload->data());
                //echo '<pre>'; print_r($data); echo '</pre>';

                $config['image_library'] = 'gd2';
                $config['source_image'] = $data['upload_data']['full_path'];
                $config['create_thumb'] = FALSE;
                $config['maintain_ratio'] = TRUE;
                $config['width']         = 500;
                $config['height']       = 500;

                $this->load->library('image_lib', $config);

                $this->image_lib->resize();

                $config['source_image'] = $data['upload_data']['full_path'];
                $config['wm_text'] = 'Copyright Feroz Akbar :P';
                $config['wm_type'] = 'text';
                //$config['wm_font_path'] = './system/fonts/texb.ttf';
                $config['wm_font_size'] = '10';
                $config['wm_font_color'] = 'ffffff';
                $config['wm_vrt_alignment'] = 'bottom';
                $config['wm_hor_alignment'] = 'center';
                $config['wm_padding'] = '5';

                $this->image_lib->initialize($config);

                $this->image_lib->watermark();

                $this->new_name = $data['upload_data']['orig_name'];

                $this->admin_layout->view('admin/post_plot',$add_attributes);
                $this->insert();
            }else{
                $error = $this->upload->display_errors();
                $add_attributes['error'] = $error;

                $this->admin_layout->view('admin/post_plot',$add_attributes);
            }


        }



    }//add

}