下面这段代码如何进行htmlentities()之类的html过滤

public function search()<br />
	{<br />
		global $_FANWE;<br />
<br />
		$page_args = array(<br />
			'city_py' => CURRENT_CITY_PY,<br />
			'sort' => trim($_FANWE['request']['sort']),<br />
			'keyword' => trim($_FANWE['request']['keyword']),<br />
		);<br />
<br />
		$keyword = '';<br />
		if(!empty($page_args['keyword']))<br />
		{<br />
			$page_args['keyword'] = urldecode($page_args['keyword']);<br />
			$keyword = &$page_args['keyword'];<br />
<br />
			$keyword_query = clearSymbol($page_args['keyword']);<br />
			if(!empty($keyword_query))<br />
			{<br />
				$search_txt = clearRepeat($keyword_query);<br />
				$keyword_query = segmentToUnicode($keyword_query,'+');<br />
                $fields = ",MATCH (gm.content) AGAINST ('$keyword_query') AS similarity ";<br />
				$where.=" WHERE MATCH (gm.content) AGAINST ('$keyword_query' IN BOOLEAN MODE)";<br />
			}<br />
			else<br />
				$keyword = '';<br />
		}<br />
<br />
		if(!empty($keyword))<br />
		{<br />
			$insert_sort = 'gk.cr_sort ASC';<br />
<br />
			$city_name = $_FANWE['current_city']['name'];<br />
<br />
			if(CURRENT_CITY_PY == CHINA_CITY_PY)<br />
			{<br />
				//全国不包含所有城市商品时<br />
				if($_FANWE['setting']['all_city'] == 0)<br />
				{<br />
					$where.=  " AND gk.city = '$city_name'";<br />
				}<br />
				else<br />
					$insert_sort = 'gk.r_sort ASC';<br />
			}<br />
			elseif(CURRENT_CITY_PY != '')<br />
			{<br />
				//城市显示全国商品时<br />
				if($_FANWE['setting']['index_all'] == 1)<br />
				{<br />
					$fields .= ",(gk.city = '$city_name') as is_now_city";<br />
					$insert_sort = 'is_now_city DESC,'.$insert_sort;<br />
					$quanguo_name = $_FANWE['cache']['city']['all'][CHINA_CITY_PY]['name'];<br />
					$where.=  " AND gk.city IN ('$city_name','$quanguo_name')";<br />
				}<br />
				else<br />
				{<br />
					$where.=  " AND gk.city = '$city_name'";<br />
				}<br />
			}<br />
<br />
			$order = '';<br />
			$sort = &$page_args['sort'];<br />
			$sort_array = array('spa'=>'g.shop_price ASC','spd'=>'g.shop_price DESC','eta'=>'gk.end_time ASC','etd'=>'gk.end_time DESC','cca'=>'g.click_count ASC','ccd'=>'g.click_count DESC','sa'=>'g.score ASC','sd'=>'g.score DESC','ba'=>'g.bought ASC','bd'=>'g.bought DESC','da'=>'discount ASC','dd'=>'discount DESC');<br />
<br />
			if(array_key_exists($sort,$sort_array))<br />
				$order = $sort_array[$sort];<br />
			else<br />
			{<br />
				unset($page_args['sort']);<br />
				$sort = '';<br />
			}<br />
<br />
			if(empty($order))<br />
				$order .= 'similarity DESC,'.$insert_sort.',gk.sort ASC,g.id ASC';<br />
			else<br />
				$order .= ',similarity DESC,'.$insert_sort.',gk.sort ASC,g.id DESC';<br />
<br />
			$goods_count = DB::resultFirst('SELECT COUNT(DISTINCT g.id)<br />
				FROM '.DB::table('goods_now_match').' AS gm<br />
				INNER JOIN '.DB::table('goods_now_key').' AS gk ON gk.id = gm.id<br />
				INNER JOIN '.DB::table('goods_now').' AS g ON g.id = gk.id '.$where);<br />
<br />
			$pager = buildPage('now/search',$page_args,$goods_count,$_FANWE['page'],24);<br />
<br />
			$res = DB::query('SELECT g.id,g.small_img,g.end_time,g.market_price,g.begin_time,g.shop_price,<br />
				gk.city,gk.site_id,g.is_best,g.bought,g.name,g.sort,g.site_name,g.collect_buy,g.click_count,<br />
				g.url,g.collect_count,g.add_time,(g.shop_price / g.market_price) AS discount,g.post_count'.$fields.'<br />
				FROM '.DB::table('goods_now_match').' AS gm<br />
				INNER JOIN '.DB::table('goods_now_key').' AS gk ON gk.id = gm.id<br />
				INNER JOIN '.DB::table('goods_now').' AS g ON g.id = gk.id '.$where.'<br />
				ORDER BY '.$order.' LIMIT '.$pager['limit']);<br />
<br />
			$goods_list = array();<br />
<br />
<br />
			while($goods = DB::fetch($res))<br />
			{<br />
				S('Goods')->goodsFormat($goods);<br />
				$goods_list[] = $goods;<br />
			}<br />
		}<br />
<br />
		include template('page/search_index');<br />
<br />
		display();<br />
	}