搜索引擎的蜘蛛访问网站是通过远程抓取页面来进行的，我们不能使用JS代码来取得蜘蛛的Agent信息，但是我们可以通过image标签，这样我们就可以得到蜘蛛的agent资料了，通过对agent资料的分析，就可以确定蜘蛛的种类、性别等因素，我们在通过数据库或者文本来记录就可以进行统计了。
数据库结构：
#
# 表的结构 `naps_stats_bot`
#
Create TABLE `naps_stats_bot` (
`botid` int(10) unsigned NOT NULL auto_increment,
`botname` varchar(100) NOT NULL default ‘’,
`botagent` varchar(200) NOT NULL default ‘’,
`bottag` varchar(100) NOT NULL default ‘’,
`botcount` int(11) NOT NULL default ‘0′,
`botlast` datetime NOT NULL default ‘0000-00-00 00:00:00′,
`botlasturl` varchar(250) NOT NULL default ‘’,
UNIQUE KEY `botid` (`botid`),
KEY `botname` (`botname`)
) TYPE=MyISAM AUTO_INCREMENT=9 ;
#
# 导出表中的数据 `naps_stats_bot`
#
Insert INTO `naps_stats_bot` VALUES (1, ‘Googlebot’, ‘Googlebot/2.X (+http://www.googlebot.com/bot.html)’, ‘googlebot’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (2, ‘MSNbot’, ‘MSNBOT/0.1 (http://search.msn.com/msnbot.htm)’, ‘msnbot’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (3, ‘Inktomi Slurp’, ‘Slurp/2.0′, ’slurp’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (4, ‘Baiduspider’, ‘Baiduspider+(+http://www.baidu.com/search/spider.htm)’, ‘baiduspider’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (5, ‘Yahoobot’, ‘Mozilla/5.0+(compatible;+Yahoo!+Slurp;+http://help.yahoo.com/help/us/ysearch/slurp)’, ’slurp’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (6, ‘Sohubot’, ’sohu-search’, ’sohu-search’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (7, ‘Lycos’, ‘Lycos/x.x’, ‘lycos’, 0, ‘0000-00-00 00:00:00′, ‘’);
Insert INTO `naps_stats_bot` VALUES (8, ‘Robozilla’, ‘Robozilla/1.0′, ‘robozilla’, 0, ‘0000-00-00 00:00:00′, ‘’);
PHP程序：
<?php
error_reporting(E_ALL & ~E_NOTICE);
function get_naps_bot()
{
$useragent = strtolower($_SERVER[\'HTTP_USER_AGENT\']);
if (strpos($useragent, \'googlebot\') !== false){
return \'Googlebot\';
}
if (strpos($useragent, \'msnbot\') !== false){
return \'MSNbot\';
}
if (strpos($useragent, \'slurp\') !== false){
return \'Yahoobot\';
}
if (strpos($useragent, \'baiduspider\') !== false){
return \'Baiduspider\';
}
if (strpos($useragent, \'sohu-search\') !== false){
return \'Sohubot\';
}
if (strpos($useragent, \'lycos\') !== false){
return \'Lycos\';
}
if (strpos($useragent, \'robozilla\') !== false){
return \'Robozilla\';
}
return false;
}
$tlc_thispage = addslashes($_SERVER[\'HTTP_USER_AGENT\']);
//添加蜘蛛的抓取记录
$searchbot = get_naps_bot();
if ($searchbot) {
$DB_naps->query("Update naps_stats_bot SET botcount=botcount+1, botlast=NOW(), botlasturl=\'$tlc_thispage\' Where botname=\'$searchbot\'");
}
?>