帮忙看下代码是否正确，删除一个月前的数据和文件。解决思路

require (dirname(__FILE__) . "/../conn.php");
mysql_select_db("news",$conn_database);
mysql_query("delete from web_news where news_date<(date(now())-60*60*24*30)");
mysql_close($conn_database);
if ($handle = opendir(dirname(__FILE__).'/../cache/')) {
  while (false !== ($file = readdir($handle))) {
      if ((time()-filectime(dirname(__FILE__).'/../cache/'.$file)) < 60*60*24*30) {
         if (strripos($file, '.html') !== false) {
          unlink(dirname(__FILE__).'/../cache/'.$file);
        }
      }
  }
}