<?
function user_agent()
{
$agent = $_SERVER['HTTP_USER_AGENT'];
            if(eregi('Googlebot/2.1',$agent)) { $tarayici = 'Googlebot 2.1'; }
            elseif(eregi('msnbot/1.0',$agent)) { $tarayici= 'MSNBot 1.0'; }
            elseif(eregi('msnbot/1.11',$agent)) { $tarayici = 'MSNBot 1.11'; }
            elseif(eregi('Yahoo! Slurp',$agent)) { $tarayici = 'Yahoo! Slurp'; }
            elseif(eregi('google',$agent)) { $tarayici = 'GoogleBot'; }
            elseif(eregi('msn',$agent)) { $tarayici = 'MsnBot'; }
            elseif(eregi('yahoo',$agent)) { $tarayici = 'YahooBot'; }
#.....
        
    

        
return $tarayici;            
}
echo user_agent();
?>