php判断来访蜘蛛信息的函数

<p>function get_naps_bot(){</p>
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                	$useragent=strtolower($_SERVER['HTTP_USER_AGENT']);<br />	if(strpos($useragent,'googlebot')!==false){<br />		return 'Googlebot';<br />	}<br />	if(strpos($useragent,'msnbot')!==false){<br />		return 'MSNbot';<br />	}<br />	if(strpos($useragent,'slurp')!==false){<br />		return 'Yahoobot';<br />	}<br />	if(strpos($useragent,'baiduspider')!==false){<br />		return 'Baiduspider';<br />	}<br />	if(strpos($useragent,'sohu-search')!==false){<br />		return 'Sohubot';<br />	}<br />	if(strpos($useragent,'lycos')!==false){<br />		return 'Lycos';<br />	}<br />	<br />	if(strpos($useragent,'robozilla')!==false){<br />		return 'Robozilla';<br />	}<br />	return false;<br />}