CodeIgniter分页类，活动链接不工作

我第一次使用codeigniter的分页类。其他一切都很好，但无论我访问哪个页面，活动链接都是[1]，它不会改变。此外，下一个按钮总是链接到第一页。不知道为什么！请帮忙！

控制器

public function unverified_images()
{           
    $data['title'] = 'Choose from the below Images to verify them >>';
    $data['total_rows'] = $this->admin_model->all_unverified_images();
    $config['base_url'] = base_url().'index.php/admin/admin/unverified_images';
    $config['total_rows'] = $data['total_rows']->num_rows();
    $config['per_page'] = 1;
    $config['num_links'] = 8;
    $config['full_tag_open'] = '<div class="pagination">';
    $config['full_tag_close'] = '</div>';
    $this->pagination->initialize($config);
    $data['query'] = $this->db->where('image_status', 0)
                    ->get('tbl_img', $config['per_page'], $this->uri->segment(4));
    $data['links']=$this->pagination->create_links();       
    $this->load->view('admin/image_verify', $data);
}
public function verify_image()
{
    $data['title'] = 'Choose from the below Images to verify them >>';
    $data['msg'] = $this->admin_model->verify_image();
    $data['query'] = $this->admin_model->all_unverified_images();
    redirect('admin/admin/unverified_images');
}

型号

function all_unverified_images()
{
    $this->db->where('image_status', 0);
    $query = $this->db->get('tbl_img');
    return $query;
}

查看

   <?php echo $links; ?>