How can I get the MAC and the IP address of a connected client in PHP?

Question

I need to know the MAC and the IP address of the connect clients, how can I do this in PHP?

Answer 1

All you need to do is to put arp into diferrent group.

Default:

-rwxr-xr-x 1 root root 48K 2008-11-11 18:11 /usr/sbin/arp*

With command:

sudo chown root:www-data /usr/sbin/arp

you will get:

-rwxr-xr-x 1 root www-data 48K 2008-11-11 18:11 /usr/sbin/arp*

And because apache is a daemon running under the user www-data, it's now able to execute this command.

So if you now use a PHP script, e.g.:

you will get the output of linux arp -an command.