限制爬虫

<?php

define('NOROBOT', TRUE);     //爬虫开关   TRUE:开启
getrobot();
if(defined('NOROBOT') && IS_ROBOT) {
exit(header("HTTP/1.1 403 Forbidden"));
}

/**

*  判断是否爬虫

* @return : bool    TRUE:为爬虫

*/
function getrobot() {

if(!defined('IS_ROBOT')) {
$kw_spiders = 'Bot|Crawl|Spider|slurp|sohu-search|lycos|robozilla';
$kw_browsers = 'MSIE|Netscape|Opera|Konqueror|Mozilla';
if(!strexists($_SERVER['HTTP_USER_AGENT'], 'http://') && preg_match("/($kw_browsers)/i", $_SERVER['HTTP_USER_AGENT'])) {
define('IS_ROBOT', FALSE);
} elseif(preg_match("/($kw_spiders)/i", $_SERVER['HTTP_USER_AGENT'])) {
define('IS_ROBOT', TRUE);
} else {
define('IS_ROBOT', FALSE);
}
}
return IS_ROBOT;

}

?>

 本文出自 “凹凸曼” 博客，请务必保留此出处http://www.apoyl.com/?p=213