取得機器網路卡的實體（MAC）位址

/**
                获取机器网卡的物理（MAC）地址
**/
class   GetMacAddr
{
                var   $return_array   =   array();   //   返回带有MAC地址的字串数组
                var   $mac_addr;

                function   GetMacAddr($os_type)
                {
                                switch   (   strtolower($os_type)   )
                                {
                                                case   "linux ":
                                                                $this-> forLinux();
                                                                break;
                                                case   "solaris ":
                                                                break;
                                                case   "unix ":
                                                                break;
                                                case   "aix ":
                                                                break;
                                                default:
                                                                $this-> forWindows();
                                                                break;
                                }

                                $temp_array   =   array();
                                foreach   (   $this-> return_array   as   $value   )
                                {
                                                if   (   preg_match(   "/[0-9a-f][0-9a-f][:-] ". "[0-9a-f][0-9a-f][:-] ". "[0-9a-f][0-9a-f][:-] ". "[0-9a-f][0-9a-f][:-] ". "[0-9a-f][0-9a-f][:-] ". "[0-9a-f][0-9a-f]/i ",   $value,   $temp_array   )   )
                                                {
                                                                $this-> mac_addr   =   $temp_array[0];
                                                                break;
                                                }
                                }
                                unset($temp_array);
                                return   $this-> mac_addr;
                }

                function   forWindows()
                {
                                @exec( "ipconfig   /all ",   $this-> return_array);
                                if   (   $this-> return_array   )
                                                return   $this-> return_array;
                                else{
                                                $ipconfig   =   $_SERVER[ "WINDIR "]. "system32ipconfig.exe ";
                                                if   (   is_file($ipconfig)   )
                                                                @exec($ipconfig. "   /all ",   $this-> return_array);
                                                else
                                                                @exec($_SERVER[ "WINDIR "]. "systemipconfig.exe   /all ",   $this-> return_array);
                                                return   $this-> return_array;
                                }
                }

                function   forLinux()
                {
                                @exec( "ifconfig   -a ",   $this-> return_array);
                                return   $this-> return_array;
                }
}
?>
$mac   =   new   GetMacAddr(PHP_OS);
echo   $mac-> mac_addr;
?>