Send File by Email through Form on Web Site?

Code:
function apply($slug=0){

  

    $slug = $this->input->post('slug');

    $data['page_data'] = $this->MVacancies->getVacancyItem($slug);

    

    $data['title'] = $data['page_data']['title'];

    $data['body'] = $data['page_data']['body'];

    $title = $data['title'];

    

    $data['main'] = 'vacancies_apply';

    $this->load->vars($data);

    $this->load->view('template'); 

        

    if(isset($_FILES['userfile']['name']))

        {        

        

        $config['upload_path'] = '../uploads/';

            $config['allowed_types'] = 'gif|jpg|png';

            $config['max_size']    = '100';

            $config['max_width']  = '1024';

            $config['max_height']  = '768';

            

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

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

          

            if ( ! $this->upload->do_upload())

            {

                $error = array('error' => $this->upload->display_errors());

                echo $config['upload_path'];

                $this->load->view('upload_form', $error);

            }    

            else

            {

                  $data = array('upload_data' => $this->upload->data());

                

            $email = 'no-reply';

            

            $file_name = !empty($data['upload_data']) ? $data['upload_data']['full_path'] : NULL ;

            //$file_name = $this->do_upload(); // _do_upload() should return the path and name of the uploaded file

            $this->email->attach($file_name);

      

            $message = "$email has applied for the $title job.";

            $this->email->from($email, '[email protected]');

            $this->email->to('[email protected]');

            

            $this->email->subject('Application for ' . $title . ' Job');

            $this->email->message($message);

            

            $this->email->send();

            

            // redirect user

            

            $this->load->view('form_success');

            

            die('Application sent successfully. Good luck!');

            // redirect to success page

        }

        

        }

        else

        {

            

            // exit

            

        }

    

  }