php记录蜘蛛爬行历史的实现代码

PHP记录蜘蛛爬行历史的代码，如下：

<? function 
//记录蜘蛛爬行记录，判断来自哪种搜索引擎
get_naps_bot()
{
$useragent = strtolower($_SERVER['HTTP_USER_AGENT']);

if (strpos($useragent, 'googlebot') !== false){
return 'Google';
}

if (strpos($useragent, 'baiduspider') !== false){
return 'Baidu';
}
if (strpos($useragent, 'msnbot') !== false){
return 'Bing';
}

if (strpos($useragent, 'slurp') !== false){
return 'Yahoo';
}

if (strpos($useragent, 'sosospider') !== false){
return 'Soso';
}

if (strpos($useragent, 'sogou spider') !== false){
return 'Sogou';
}

if (strpos($useragent, 'yodaobot') !== false){
return 'Yodao';
}
return false;
}

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

$searchbot = get_naps_bot();

//保存爬行记录
if ($searchbot) {
   $tlc_thispage = addslashes($_SERVER['HTTP_USER_AGENT']);
   $url=$_SERVER['HTTP_REFERER'];
   $file="robotlog.txt";
   $time=nowtime();
   $data=fopen($file,"a");
   fwrite($data,"Time:$time robot:$searchbot URL:$tlc_thispagen");
    fclose($data);
}
?>