upload multiple file di codeigniter

public function upload_foto($data,$no_pendaftaran)
    {
        $config['upload_path'] = './files/scan_foto' ;
        $config['allowed_types'] = 'jpg|jpeg|png';
        $config['max_size']  = '400';
        $config['remove_space'] = TRUE;
        $config['file_name'] = $data.$no_pendaftaran;

        $this->load->library('upload', $config,'foto_upload');
        $this->foto_upload->initialize($config);
        if (!$this->foto_upload->do_upload($data)){
            return array('result'=>FALSE,'file'=>'','error' => $this->foto_upload->display_errors());
        }
        else{
            return array('result'=>TRUE,'file'=>$this->foto_upload->data(),'upload_data' => $this->foto_upload->data());
        }
    }

public function upload_ktp($data,$no_pendaftaran)
    {
        $config['upload_path'] = './files/scan_ktp' ;
        $config['allowed_types'] = 'jpg|jpeg|png';
        $config['max_size']  = '400';
        $config['remove_space'] = TRUE;
        $config['file_name'] = $data.$no_pendaftaran;

        $this->load->library('upload', $config,'ktp_upload');
        $this->ktp_upload->initialize($config);
        if (!$this->ktp_upload->do_upload($data)){
            return array('result'=>FALSE,'file'=>'','error' => $this->ktp_upload->display_errors());
        }
        else{
            return array('result'=>TRUE,'file'=>$this->ktp_upload->data(),'upload_data' => $this->ktp_upload->data());
        }
    }