How to display conditional 404 on product page in OpenCard?

Question

opencart

Good afternoon, there is a get parameter with the page number, but the problem is that if you specify the page 999999, it returns that there are no products, how to make it return 404 when requesting a page on which there are no products?

Answer 1

For example 2.3:
ControllerProductCategory
Find

if ($limit && ceil($product_total / $limit) > $page) {
          $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'] . '&page='. ($page + 1), true), 'next');
      }

add after

if ($limit && ceil($product_total / $limit) < $page) {
  $url = '';

  if (isset($this->request->get['path'])) {
    $url .= '&path=' . $this->request->get['path'];
  }

  if (isset($this->request->get['filter'])) {
    $url .= '&filter=' . $this->request->get['filter'];
  }

  if (isset($this->request->get['sort'])) {
    $url .= '&sort=' . $this->request->get['sort'];
  }

  if (isset($this->request->get['order'])) {
    $url .= '&order=' . $this->request->get['order'];
  }

  if (isset($this->request->get['page'])) {
    $url .= '&page=' . $this->request->get['page'];
  }

  if (isset($this->request->get['limit'])) {
    $url .= '&limit=' . $this->request->get['limit'];
  }

  $data['breadcrumbs'][] = array(
    'text' => $this->language->get('text_error'),
    'href' => $this->url->link('product/category', $url)
  );

  $this->document->setTitle($this->language->get('text_error'));

  $data['heading_title'] = $this->language->get('text_error');

  $data['text_error'] = $this->language->get('text_error');

  $data['button_continue'] = $this->language->get('button_continue');

  $data['continue'] = $this->url->link('common/home');

  $this->response->addHeader($this->request->server['SERVER_PROTOCOL'] . ' 404 Not Found');

  $data['column_left'] = $this->load->controller('common/column_left');
  $data['column_right'] = $this->load->controller('common/column_right');
  $data['content_top'] = $this->load->controller('common/content_top');
  $data['content_bottom'] = $this->load->controller('common/content_bottom');
  $data['footer'] = $this->load->controller('common/footer');
  $data['header'] = $this->load->controller('common/header');

  $this->response->setOutput($this->load->view('error/not_found', $data));
}