PHP - Get Machine name

[Fratozzi]

Hi everyone, I'm trying to get the name of the machine in use. If I use this feature locally, it works.

   function visitor_machine_name(){
        $machine_name = gethostbyaddr($_SERVER['REMOTE_ADDR']);

        return $machine_name;
    }

But as soon as I try it on an online server I get the DNS name back, like this:

mob-3-91-125-82.net.vodafone.it

What can I do?
   

[requinix]

You cannot get the name of the computer. The internet does not work that way.

[Fratozzi]

1 minute ago, requinix said:

You cannot get the name of the computer. The internet does not work that way.

Is there no way to get it? For example using JS.
That is, how does DropBox, for example, obtain the name of the logged device?

[requinix]

Just now, Fratozzi said:

That is, how does DropBox, for example, obtain the name of the logged device?

By installing software.

[Fratozzi]

Just now, requinix said:

By installing software.

I don't have any software installed on my pc regarding DropBox, yet it gets my device name. If I connect to their site

[requinix]

1 minute ago, Fratozzi said:

I don't have any software installed on my pc regarding DropBox, yet it gets my device name. If I connect to their site

It is not possible for some website on the internet to get the name of your computer. I don't know what you're doing or looking at.

[Fratozzi]

2 minutes ago, requinix said:

It is not possible for some website on the internet to get the name of your computer. I don't know what you're doing or looking at.

what I need is the name of the device I am using to access a site.  for example PC-Fra.  Anyway thank you for replying 😊

[requinix]

1 minute ago, Fratozzi said:

what I need is the name of the device I am using to access a site.  for example PC-Fra.  Anyway thank you for replying 😊

Then I was understanding you correctly. It is not possible. Not through PHP or Javascript or anything other than installing software on the user's computer.

[Fratozzi]

On 1/19/2020 at 12:21 PM, requinix said:

Then I was understanding you correctly. It is not possible. Not through PHP or Javascript or anything other than installing software on the user's computer.

In case using $ _SERVER ["REMOTE_ADDR"]; to get the name of the dns how can I remove all those characters and know only the final part? For example:

With that function I get this:

mob-3-91-125-82.net.vodafone.it
host86-197-dynamic.3-87-r.retail.telecomitalia.it
93-32-55-29.ip32.fastwebnet.it
mob-5-90-154-87.net.vodafone.it

I would like this instead:
net.vodafone.it
retail.telecomitalia.it
ip32.fastwebnet.it

That should be the name of the internet provider I connect to.
Thanks

[Barand]

try

function getISP($str)
{
    $k = strlen($str);
    while (!ctype_digit($str[--$k]))
        ;
    $p = strpos($str, '.', $k);
    return substr($str, $p+1);
}

echo getISP('host86-197-dynamic.3-87-r.retail.telecomitalia.it');           //--> retail.telecomitalia.it

 

[Barand]

On second thoughts

function getISP($str)
{
    $a = explode('.', $str);
    return join('.', array_slice($a, -3));
}

 

[Fratozzi]

Thanks so much!