PHP – Class Bot Identifier

The class can determine if the current user is a bot.

It analyzes the HTTP request user agent and determines if it identifies a known bot.

Currently it can identify Google bot, MSN bot, Slurp, Yahoo, Ask Jeeves, Fast Crawler, InfoSeek, 
Lycos, Yandex, Geo Hasher, GigaBlast, Baidu and Spinn3r.

Code Example:

<?php 
class BotIdentifier {
    
    protected $arrstrBotMatches;

    function __construct() {
    
        //array of bots/spiders
        //You can add bots that are hitting your site see your apache servers log.
        $arrstrBots = array (
             'googlebot'        => '/Googlebot/',
             'msnbot'           => '/MSNBot/',
             'slurp'            => '/Inktomi/',
             'yahoo'            => '/Yahoo/',
             'askjeeves'        => '/AskJeeves/',
             'fastcrawler'        => '/FastCrawler/',
             'infoseek'         => '/InfoSeek/',
             'lycos'            => '/Lycos/',             
             'yandex'            => '/YandexBot/',             
             'geohasher'        => '/GeoHasher/',             
             'gigablast'        => '/Gigabot/',
             'baidu'            => '/Baiduspider/',
             'spinn3r'            => '/Spinn3r/'        //add comma seprated bots here
        );
            
        //check if bot request
        if( true == isset( $_SERVER['HTTP_USER_AGENT'] )) {
    
            $this->arrstrBotMatches = preg_filter( $arrstrBots, array_fill( 1, count( $arrstrBots ), '$0' ), array( trim( $_SERVER['HTTP_USER_AGENT'] )));
        }
    }

    function getBot() {
    
        //check if bot request and return the identified bot.
        return ( true == is_array( $this->arrstrBotMatches ) && 0 < count( $this->arrstrBotMatches )) ? $this->arrstrBotMatches[0] : 'Not a bot request';        
    }
    
    //isBot() can be used to check if the request is bot request before incrementing the visit count.
    function isBot() {
        //check if bot request.
        return ( true == is_array( $this->arrstrBotMatches ) && 0 < count( $this->arrstrBotMatches )) ? 1 : 0;                
    }
}

//$_SERVER['HTTP_USER_AGENT'] = 'Googlebot/2.1 (+http://www.googlebot.com/bot.html)';

$objBot = new BotIdentifier();
echo '<b>User Agent: </b>' . $_SERVER['HTTP_USER_AGENT'];
echo '<br><b>Is Bot/Spider: </b>' . $boolIsBot = $objBot->isBot();
echo '<br><b>Bot User Agent: </b>' . $strBot = $objBot->getBot();

?>