初学黑客：php获取服务器路径及访客信息

echo "php获取当前url
";
$url = "http://".$_SERVER ['HTTP_HOST'].$_SERVER['PHP_SELF'];
echo $url;
?>

以下代码是：php获取网站根目录

$PHP_SELF=$_SERVER['PHP_SELF'];
$url='http://'.$_SERVER['HTTP_HOST'].substr($PHP_SELF,0,strrpos($PHP_SELF,'/')+1);
echo $url;
?>
-->

php获取访客信息

print_r($_SERVER['CERT_SERIALNUMBER']);
print_r($_SERVER);
?>