catalog/controller/information/sitemap.php

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<?php
class ControllerInformationSitemap extends Controller {
	public function index() {
		$this->load->language('information/sitemap');

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

		$data['breadcrumbs'] = array();

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('text_home'),
			'href' => $this->url->link('common/home')
		);

		$data['breadcrumbs'][] = array(
			'text' => $this->language->get('heading_title'),
			'href' => $this->url->link('information/sitemap')
		);

		$this->load->model('catalog/category');
		$this->load->model('catalog/product');

		$data['categories'] = array();

		$categories_1 = $this->model_catalog_category->getCategories(0);

		foreach ($categories_1 as $category_1) {
			$level_2_data = array();

			$categories_2 = $this->model_catalog_category->getCategories($category_1['category_id']);

			foreach ($categories_2 as $category_2) {
				$level_3_data = array();

				$categories_3 = $this->model_catalog_category->getCategories($category_2['category_id']);

				foreach ($categories_3 as $category_3) {
					$level_3_data[] = array(
						'name' => $category_3['name'],
						'href' => $this->url->link('product/category', 'path=' . $category_1['category_id'] . '_' . $category_2['category_id'] . '_' . $category_3['category_id'])
					);
				}

				$level_2_data[] = array(
					'name'     => $category_2['name'],
					'children' => $level_3_data,
					'href'     => $this->url->link('product/category', 'path=' . $category_1['category_id'] . '_' . $category_2['category_id'])
				);
			}

			$data['categories'][] = array(
				'name'     => $category_1['name'],
				'children' => $level_2_data,
				'href'     => $this->url->link('product/category', 'path=' . $category_1['category_id'])
			);
		}

		$data['special'] = $this->url->link('product/special');
		$data['account'] = $this->url->link('account/account');
		$data['edit'] = $this->url->link('account/edit');