php - codeigniter upload file $_FILES returns empty array array(0) { } -

i have function upload image inserts image name database fine. created new function called edit() exact same code allows user edit form , upload image. image name update existing image name in database.

however, every time user edits form , chooses new image, instead of saving new image name, wipes the previous name database , display nothing.

my controller:

  public function edit(){           $this->form_validation->set_rules('title', 'title', 'required|xss_clean|trim|is_unique[news.title]');     $this->form_validation->set_rules('description', 'description', 'required|xss_clean|trim');     $this->form_validation->set_rules('notes', 'notes', 'required|xss_clean|trim');         if ($this->form_validation->run() == false)       {                 $data['error'] =  '';             $data['page_title']="edit news";                 $this->load->view("edit_news_form",$data);             }           else {                 $new = array(                'upload_path' => "./images/news",                'allowed_types' => "gif|jpg|png|jpeg|jpg",                'overwrite' =>false,                          'max_height' => "768",                'max_width' => "1024"                           );                    $this->load->library('upload', $new);                   $this->load->helper(array('form', 'url'));             if(isset($_files)) {                           if($this->upload->do_upload())                      {                     $data = array('upload_data' => $this->upload>data());                          $this->load->view('manage_news',$data);                       }                       else {               if(empty($_files['userfile']['name'])){ $imagename ='';}                     else {                               $message2 = "please choose file type. gif,jpg,png,jpeg ";                          echo "<script type='text/javascript'>alert('$message2');</script>";                           redirect('resetpasswordcontroller/edit_news_form', 'refresh');                         }                                                 }               }              $this->db->trans_start();                    $imagename = $this->upload->data();          $data = array(             'image'=>$imagename['file_name'],                   );         $this->users_model->update($id,$data);         $this->db->trans_complete();            $message2 = "the selected news has been edited";          echo "<script type='text/javascript'>alert('$message2');</script>";             redirect('resetpasswordcontroller/manage_news', 'refresh');      }     } 

my view:

 <?php echo form_open_multipart('resetpasswordcontroller/news');?>  <label>image</label>  <input name = "userfile" type="file" />  <label> <input type="submit" name="submit" value="save , continue">  </label>   

my model:

    function update($id,$data){     $this->db->where('id', $id);     $this->db->update('news',$data);     } 

my model function working because updating database nothing.i think problem view , controller.

when type var_dump($_files) returns empty array means no file selected.

how can fix this?

                    $this->load->library('upload');                     $config = array(                                 'upload_path'   => './uploads/',                                 'allowed_types' => 'gif|jpg|png|pdf|doc|docx',                                 'max_size'      => 10000,                                 'overwrite'     => false                         );                      $files = $_files;                     $cpt = count($_files['file']['name']);                     for($i=0; $i<$cpt; $i++)                    {                           $_files['userfile']['name']     = $files['file']['name'][$i];                         $_files['userfile']['type']     = $files['file']['type'][$i];                         $_files['userfile']['tmp_name'] = $files['file']['tmp_name'][$i];                         $_files['userfile']['error']    = $files['file']['error'][$i];                         $_files['userfile']['size']     = $files['file']['size'][$i];                              $this->upload->initialize($config);                         $this->upload->do_upload();                          <!-- insert db here --->                    } 

you can use reference works me.