Ottieni l'indirizzo MAC del client usando PHP, Angular js, jQuery / JavaScript [chiuso]

ipAddress=$_SERVER['REMOTE_ADDR'];
$macAddr=false;

#run the external command, break output into lines
$arp='arp -a $ipAddress';
$lines=explode("\n", $arp);

#look for the output line describing our IP address
foreach($lines as $line)
{
   $cols=preg_split('/\s+/', trim($line));
   if ($cols[0]==$ipAddress)
   {
       $macAddr=$cols[1];
   }
}
echo $macAddr;

Non funziona nel server.