php – Codeigniter,使用URL作为查询参数

我正在使用codeigniter,我正在尝试创建一个页面,如果网址输入example.com/mobil/bekas/toyota/avanza它显示所有二手车有丰田作为品牌和avanza作为模型,如果网址输入示例. com / mobil / bekas / toyota它显示了所有使用丰田作为品牌的二手车.

这是我的控制器：

public function bekas($brand_nama,$model_nama='NULL')
        {      
               $this->load->model('listing_model');
               $data['cars'] = $this->listing_model->viewListingByBrandAndModel($brand_nama,$model_nama);
               $this->load->view('product_listing.php',$data);
        }

这是模型：

function viewListingByBrandAndModel($brand_nama,$model_nama)
    {

        $this->load->library('pagination');
            $this->load->library('table');
            $config['base_url'] = 'http://example.com/mobil/bekas/'.$brand_nama.'/'.$model_nama;
            $config['total_rows'] = $this->db->select('*')
                            ->join('car_list_tbl','car_list_tbl.car_list_ID = user_listing_tbl.car_list_ID')
                            ->join('member_tbl','member_tbl.mID = user_listing_tbl.mID')
                            ->join('model_tbl','model_tbl.model_ID = car_list_tbl.model_ID')
                            ->join('series_tbl','series_tbl.series_ID = car_list_tbl.series_ID')
                            ->join('body_type_tbl','body_type_tbl.body_type_nama = car_list_tbl.body_type_nama')
                            ->join('brand_tbl','brand_tbl.brand_name = car_list_tbl.brand_name')
                            ->where('car_list_tbl.brand_name',$brand_nama)
                            ->like('model_tbl.model_nama',$model_nama)
                            ->where('user_listing_tbl.listing_type','BEKAS')
                            ->get('user_listing_tbl')->num_rows();
            $config['per_page'] = 20;
            $config['num_links'] = 10;
            $config['display_pages'] = TRUE;
            $config['full_tag_open'] = '<ul class="pagination">';
            $config['full_tag_close'] = '</ul>';
            $config['cur_tag_open'] = '<li class="active"><a href="#">';
            $config['cur_tag_close'] = '</a></li>';
            $config['num_tag_open'] = '<li>';
            $config['num_tag_close'] = '</li>';
            $config['first_link'] = FALSE;
            $config['last_link'] = FALSE;
            $config['prev_link'] = false;
            $config['next_link'] = false;
            $config['next_tag_open'] = '<li><a href="#"><i class="fa fa-chevron-left">';
            $config['next_tag_close'] = '</i></a></li>';
            $config['prev_tag_open'] = '<li><a href="#"><i class="fa fa-chevron-right">';
            $config['prev_tag_close'] = '</i></a></li>';
            $this->pagination->initialize($config);

             //Pagination End

            $sql = $this->db->select('*')
                            ->join('car_list_tbl','member_tbl.mID = user_listing_tbl.mID')
                            ->join('brand_tbl','brand_tbl.brand_name = car_list_tbl.brand_name')
                            ->join('model_tbl','series_tbl.series_ID = car_list_tbl.series_ID')
                            ->where('car_list_tbl.brand_name','BEKAS')
                            ->get('user_listing_tbl',$config['per_page'],$this->uri->segment(5));
            return $sql->result();

我仍然是网络编程的新手,我可以输入我缺少的部分吗？因为它在我键入example.com/mobil/bekas/toyota/avanza时有效,但当我键入example.com/mobil/bekas/toyota时它不会显示任何内容

$this->db->select('*')
    ->join('car_list_tbl','car_list_tbl.car_list_ID = user_listing_tbl.car_list_ID')
    ->join('member_tbl','member_tbl.mID = user_listing_tbl.mID')
    ->join('brand_tbl','brand_tbl.brand_name = car_list_tbl.brand_name')
    ->join('model_tbl','model_tbl.model_ID = car_list_tbl.model_ID')
    ->join('series_tbl','series_tbl.series_ID = car_list_tbl.series_ID')
    ->where('car_list_tbl.brand_name',$brand_nama);

if($model_nama){
    $this->db->like('model_tbl.model_nama',$model_nama);
}
    $this->db->where('user_listing_tbl.listing_type','BEKAS');
    ->get('user_listing_tbl',$this->uri->segment(5));
return $this->db->result();