public function get_category_ids($category) {
		$cateinfo = $this->fetch_one('category', 'id', "url_token = '".$category."' or id = '".$category."'");	
		$cateall = $this->fetch_all('category',"parent_id = ".$cateinfo);
		$cate ='';
		foreach ($cateall as $val) {
			$cate .= $val['id'].',';
		}
		$category_ids = $cate.$cateinfo;
		//print_r($category_ids);
		return $category_ids;
	}

public function get_articles_list($category_id, $page, $per_page, $order_by) {
		if ($category_id) {
			$where = 'category_id IN ('.$category_id.')';
		}
		return $this->fetch_page('article', $where, $order_by, $page, $per_page);
	}

if ($_GET['feature_id']) {
			$article_list = $this->model('article')->get_articles_list_by_topic_ids($_GET['page'], get_setting('contents_per_page'), 'add_time DESC', $this->model('feature')->get_topics_by_feature_id($_GET['feature_id']));		
			$article_list_total = $this->model('article')->article_list_total;			
			if ($feature_info = $this->model('feature')->get_feature_by_id($_GET['feature_id'])) {
				$this->crumb($feature_info['title'], '/article/square/feature_info-' . $category_info['id']);			
				TPL::assign('feature_info', $feature_info);
			}
		} else {
			if ($_GET['category']) {
				$category_ids = $this->model('category')->get_category_ids($_GET['category']);
			}
			$article_list = $this->model('article')->get_articles_list($category_ids, $_GET['page'], get_setting('contents_per_page'), 'add_time DESC');			
			$article_list_total = $this->model('article')->found_rows();
		}