$host = $config['db']['host'];
$user = $config['db']['username'];
$pass = $config['db']['password'];
$database = $config['db']['name'];

$ua = $_SERVER['HTTP_USER_AGENT'];
if(stristr($ua, 'msnbot') || stristr($ua, 'googlebot') || stristr($ua, 'Ask Jeeves') || stristr($ua, 'Yahoo! Slurp')){
//it's pretending to be MSN's bot or Google's bot or yahoo slurp
$ip = $_SERVER['REMOTE_ADDR'];

$hostname = gethostbyaddr($ip);
if(!preg_match("/\.googlebot\.com$/", $hostname) && !preg_match("/\.search\.msn\.com$/", $hostname) && !preg_match("/\.crawl\.yahoo\.net$/", $hostname) && !preg_match("/\.ask\.com$/", $hostname)){
//the hostname does not belong to either msn.com or googlebot.com or crawl yahoo.
//Remember the UA already said it is either MSNBot or Googlebot.
//Fake.
//echo "Not Allowed";
//Optional php header 404 page
header("HTTP/1.1 403 Forbidden");