搜索引擎蜘蛛捕捉器(PHP)

实现蜘蛛捕捉的PHP代码如下：

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functionget_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';
}
returnfalse;
}


functionnowtime(){
$date=date("Y-m-d.G:i:s");
return$date;
}

$searchbot=get_naps_bot();

if($searchbot){
$tlc_thispage=addslashes($_SERVER['HTTP_USER_AGENT']);
$url=$_SERVER['HTTP_REFERER'];
$file="robotlog.txt";
$time=nowtime();
$data=fopen($file,"a");
fwrite($data,"Time:$timerobot:$searchbotURL:$tlc_thispage ");
fclose($data);
}