PHP effective and secure filtering get, posd, cookie_PHP tutorial

php 有效安全过滤get,posd,cookie

php 有效安全过滤get,posd,cookie
session_set_cookie_params(0, COOKIE_PATH, COOKIE_DOMAIN);

if($_REQUEST)
{
 if(MAGIC_QUOTES_GPC)
 {
  $_REQUEST = new_stripslashes($_REQUEST);
  if($_COOKIE) $_COOKIE = new_stripslashes($_COOKIE);
 }
 else
 {
  $_POST = new_addslashes($_POST);
  $_GET = new_addslashes($_GET);
  $_COOKIE = new_addslashes($_COOKIE);
  @extract($_POST);
  @extract($_GET);
  @extract($_COOKIE);
 }
 if(!defined('IN_ADMIN')) $_REQUEST = filter_xss($_REQUEST, ALLOWED_HTMLTAGS);
 extract($db->escape($_REQUEST), EXTR_SKIP);
 if($_COOKIE) $db->escape($_COOKIE);
}
if(QUERY_STRING && strpos(QUERY_STRING, '=') === false && preg_match("/^(.*).(htm|html|shtm|shtml)$/", QUERY_STRING, $urlvar))
{
 parse_str(str_replace(array('/', '-', ' '), array('&', '=', ''), $urlvar[1]));
}