<?php

function get_mac_address1() {
    exec("ipconfig /all", $arr, $retval);
    $arr[14];
    $ph = explode(":", $arr[14]);
    return trim($ph[1]);
}

function get_mac_address2() {
    ob_start(); // Turn on output buffering
    system('ipconfig /all'); //Execute external program to display output
    $mycom = ob_get_contents(); // Capture the output into a variable
    ob_clean(); // Clean (erase) the output buffer

    $findme = 'Physical';
    $pmac = strpos($mycom, $findme); // Find the position of Physical text
    $mac = substr($mycom, ($pmac + 36), 17); // Get Physical Address
    return $mac;
}

echo "<pre>";

echo get_mac_address1(), PHP_EOL;

echo get_mac_address2(), PHP_EOL;

echo "</pre>";