How to get category id in special module?

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'cat_id' => $this->request->get['path'],

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

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

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$this->load->model('tool/image');

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

			$parts = explode('_', (string)$this->request->get['path']);

			$category_id = (int)array_pop($parts);

			foreach ($parts as $path_id) {
				if (!$path) {
					$path = $path_id;
				} else {
					$path .= '_' . $path_id;
				}

				$category_info = $this->model_catalog_category->getCategory($path_id);

				if ($category_info) {
					$data['breadcrumbs'][] = array(
						'text' => $category_info['name'],
						'href' => $this->url->link('product/category', 'path=' . $path)
					);
				}
			}

			// Set the last category breadcrumb
			$category_info = $this->model_catalog_category->getCategory($category_id);

			if ($category_info) {
				$url = '';

				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' => $category_info['name'],
					'href' => $this->url->link('product/category', 'path=' . $this->request->get['path'] . $url)
				);
			}
		}

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$categories = $this->model_catalog_product->getCategories($result['product_id']);
if($categories){
    $categories_info = $this->model_catalog_category->getCategory($categories[0]['category_id']);
    $id = $categories_info['category_id'];
}else{
    $id = '';
}