Contribute PHP get the MAC address of the NIC

<?php
/**
Get the physical (MAC) address of the machine's network card
WWA $Exp
**/
Class Getmacaddr
{
var $return _array = Array (); Returns an array of strings with a MAC address
var $mac _addr;

function getmacaddr ($os _type)
{
Switch (Strtolower ($os _type))
{
Case "Linux":
$this->forlinux ();
Break
Case "Solaris":
Break
Case "UNIX":
Break
Case "AIX":
Break
Default
$this->forwindows ();
Break
}

$temp _array = Array ();
foreach ($this->return_array as $value)
{
if (Preg_match ("/[0-9a-f][0-9a-f][:-]". " [0-9a-f] [0-9a-f] [:-]"." [0-9a-f] [0-9a-f] [:-]"." [0-9a-f] [0-9a-f] [:-]"." [0-9a-f] [0-9a-f] [:-]"." [0-9a-f] [0-9a-f]/i ", $value, $temp _array))
{
$this->mac_addr = $temp _array[0];
Break
}
}
unset ($temp _array);
return $this->mac_addr;
}

function Forwindows ()
{
@exec ("Ipconfig/all", $this->return_array);
if ($this->return_array)
return $this->return_array;
else{
$ipconfig = $_server["windir"]. " \system32\ipconfig.exe ";
if (Is_file ($ipconfig))
@exec ($ipconfig. "/all", $this->return_array);
Else
@exec ($_server["windir"]. " \system\ipconfig.exe/all ", $this->return_array);
return $this->return_array;
}
}

function Forlinux ()
{
@exec ("Ifconfig-a", $this->return_array);
return $this->return_array;
}
}
?>
?
$mac = new Getmacaddr (php_os);
Echo $mac->mac_addr;
?>