PHP NT MAC地址保存

下面的代码是如何获取的MAC地址。
在底层，不能授予另一个网络时，PHP引擎和Windows NT机器
MAC地址可以通过Microsoft的NetBEUI协议


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';
 }
}

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