Sitedeki Ziyaretçiler,Botlar

<?php
echo $_SERVER['HTTP_USER_AGENT'];
?>

function crawlerDetect($USER_AGENT)
{
    $crawlers = array(
    array('Google', 'Google'),
    array('msnbot', 'MSN'),
    array('Rambler', 'Rambler'),
    array('Yahoo', 'Yahoo'),
    array('AbachoBOT', 'AbachoBOT'),
    array('accoona', 'Accoona'),
    array('AcoiRobot', 'AcoiRobot'),
    array('ASPSeek', 'ASPSeek'),
    array('CrocCrawler', 'CrocCrawler'),
    array('Dumbot', 'Dumbot'),
    array('FAST-WebCrawler', 'FAST-WebCrawler'),
    array('GeonaBot', 'GeonaBot'),
    array('Gigabot', 'Gigabot'),
    array('Lycos', 'Lycos spider'),
    array('MSRBOT', 'MSRBOT'),
    array('Scooter', 'Altavista robot'),
    array('AltaVista', 'Altavista robot'),
    array('IDBot', 'ID-Search Bot'),
    array('eStyle', 'eStyle Bot'),
    array('Scrubby', 'Scrubby robot')
    );
 
    foreach ($crawler as $c)
    {
        if (stristr($USER_AGENT, $c[0]))
        {
            return($c[1]);
        }
    }
 
    return false;
}
 
// example
 
$crawler = crawlerDetect($_SERVER['HTTP_USER_AGENT']);
 
if ($crawler )
{
   // it is crawler, it's name in $crawler variable
}
else
{
   // usual visitor
}