Get the client's computer name

I am getting the client's (website user's) IP address. Now I'd like to go one step further by knowing the user's computer name. So far, my research has not turned up anything to aid me in retrieving this information.

Is it possible to use the user's IP address, or some other 开发者_开发技巧means, to get my visitor's computer name using PHP?

PHP 5.4+

gethostbyaddr($_SERVER['REMOTE_ADDR'])

You can perform a reverse DNS lookup using gethostbyaddr().

Note that this will give you the name of the host the request came from according to reverse DNS.

• It will not give you a result if reverse DNS isn't set up
• It will not give you the Windows name of the computer
• It will give you the name of the router if NAT is involved or proxy if a proxy is involved.

Not possible with plain php running on the server. It'd be a security/privacy issue to know details of the client such as computer name, mac address, contents of his drive.

You need some sort of application running on the client's machine in order to get this.

If you're referring to the hostname (displayed for instance by the hostname command on linux) of the computer doing the request:

That information is not included in an HTTP request. (That is, it's impossible for PHP to figure out.)

You could do a reverse DNS lookup, but that's probably not what you want anyway.

This is all that you could get using just PHP (you may try these butIi dont think this is what you actually needed):

gethostname()
gethostbyname(gethostname())
$_SERVER['HTTP_HOST']
$_SERVER['SERVER_SIGNATURE']
$_SERVER['SERVER_NAME']
$_SERVER['SERVER_ADDR']
$_SERVER['SERVER_PORT']
$_SERVER['REMOTE_ADDR']
gethostbyaddr($_SERVER['REMOTE_ADDR'])
php_uname()

The only thing you could do is try to get a DNS name for the client. "Computer Name" is a Windows made-up thing. Just call the built-in function gethostbyaddr() with the client's IP address. However, it won't always (hardly ever) work.

You can do this by

$_SERVER['REMOTE_HOST']

'REMOTE_HOST' - The Host name from which the user is viewing the current page. The reverse dns lookup is based off the REMOTE_ADDR of the user.

Note: Your web server must be configured to create this variable. For example in Apache you'll need HostnameLookups On inside httpd.conf for it to exist. As David mentioned you can also use . gethostbyaddr()

Pls go thru all the comments in the url before actually using the function.

Do something lik this:

     <?php
 //get host by name
 echo gethostname();
 echo "<br>";
 //get OS
 echo php_uname();
 ?>