问如何在codeigniter中重置方法

EN

$this->upload->display_errors()

$error[$i]= "File error: ".$this->upload->display_errors();

          public function do_upload($product_id)
        {
            $error = array();

            if(isset($_FILES['files']['name'])&&!empty($_FILES['files']['name'][0])):

         for ($i=0; $i <count($_FILES['files']['name']) ; $i++) :


                $config['upload_path']          = './images/';
                $config['allowed_types']        = 'gif|jpg|png';
                $config['max_size']             = 1;



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





              $_FILES['files[]']['name'] = $_FILES['files']['name'][$i];
              $_FILES['files[]']['tmp_name'] = $_FILES['files']['tmp_name'][$i];
              $_FILES['files[]']['size'] = $_FILES['files']['size'][$i];

               if(!$this->upload->do_upload('files[]')){


 $error[$i]= "File name: ". $_FILES['files']['name'][$i] ." ". $this->upload->display_errors() ."<br>";

               }else{

              $files = $this->upload->data();

$data = array('file_name'=>$files['file_name'],'product_id'=>$product_id,'file_type'=>$files['file_type']);

               $this->Files_model->create_file($data);
               }





endfor;








  endif;
 return $error;
//end method
        }