实现蜘蛛捕捉的PHP代码 (WEB爬虫)

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;
}


function nowtime(){
$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($data,"Time:$time robot:$searchbot URL:$tlc_thispage ");
fclose($data);
}