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 />	}