ปรึกษาเรื่อง MAC Address หน่อยครับ จากกระทู้ 026963 ผมเลยมาต่อให้จาก code ข้างล่างครับ

/**
* Class NtMacAddress
* Returns client or server Mac Address in an intranet NT5 or NT5.1 LAN
* -----------------------------------------------
* EXAMPLE:
* $mac = &new NtMacAddress();
* echo 'SERVER MAC: '.$mac->getMac( 'server' ).'<br />CLIENT MAC: '.$mac->getMac( 'client' );
* 
* NOTE: This class works only in a LAN then you will not read anything if try on localhost.
* So please use from another PC.
* _______________________________________________
*
* @author Andrea Giammarchi
* @compatibility Windows 2000 / Server , Windows XP
* ( but maybe found *nix and other OS client macaddress too )
* @site www.3site.it
* @date 09/10/2004
* @version 1.0 tested only on Win 2K / XP
*/
class NtMacAddress {

/**
* Public method getMach. Returns client or server mac-address if is readable.
*
* NtMacAddress->getMac( $what:String ):String
*
* @param String Options: 'client' or 'server'
* @return String Mac-Address if is readable, 'not found' otherwise
*/
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\' ?';
}
}

/**
* Private method __server_macaddress. Returns server mac-address if is readable.
*
* NtMacAddress->__server_macaddress():String
*
* @param no
* @return String Server Mac-Address if is readable, 'not found' otherwise
*/
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';
}

/**
* Private method __client_macaddress. Returns client mac-address if is readable.
*
* NtMacAddress->__client_macaddress():String
*
* @param no
* @return String Client Mac-Address if is readable, 'not found' otherwise
*/
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';
}
}