How to get mac address in all pc and device or tablet using php

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PHP

Hello sir,
I am working androidphonegap. I want to device mac address. How to get in php and javascript. Please help me. I'm using this code.

$ipAddress=$_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 ($col[0]==$ipAddress)
   {
     $macAddr=$col[1];
   }
}

But display for ip address only.mac address how to get.