php mac adresi bulma

<?
class NtMacAddress {

    function getMac( $what ) {
        $what = &strtolower( $what );
        if( $what == 'server' ) {
            return $this->__server_macaddress();
        }
        elseif( $what == 'client' ) {
            return $this->__client_macaddress();
        }
        else {
            return '\'client\' or \'server\' ?';
        }
    }


    function __server_macaddress() {
        $output = Array();
        exec( 'netstat -r', $output );
        for( $a = 0, $b = &count( $output ); $a < $b; $a++ ) {
            if( preg_match( "/(?i)([a-z0-9]{2} ){6}/", $output[$a] ) == true ) {
                $macaddress = &$output[$a];
                $uniquekey = &md5( $macaddress );
                $output[$a] = &preg_replace( "/(?i)([^a-z0-9]*?)([a-z0-9]{2} ){6}/i", "\\1 {$uniquekey} ", $output[$a] );
                $output[$a] = &explode( " {$uniquekey} ", $output[$a] );
                $uniquekey = Array( trim( $output[$a][0] ), trim( $output[$a][1] ) );
                $macaddress = &str_replace( $uniquekey, "", $macaddress );
                return trim( $macaddress );
            }
        }
        return 'not found';
    }


    function __client_macaddress() {
        $output = Array();
        exec( 'nbtstat -A '.$_SERVER['REMOTE_ADDR'], $output );
        $reg = '([a-f0-9]{2}\-){5}([a-f0-9]{2})';
        for( $a = 0, $b = &count( $output ); $a < $b; $a++ ) {
            if( preg_match( "/(?i){$reg}/", $output[$a] ) == true ) {
                    return preg_replace( "/(?iU)(.+)({$reg})(.*)/", "\\2", $output[$a] );
            }
        }
        return 'not found';
    }
}

        $mac = &new NtMacAddress();
       echo 'SERVER MAC: '.$mac->getMac( 'server' ).'<br />CLIENT MAC: '.$mac->getMac( 'client' );
?>