PHP擷取Mac地址____PHP

<?php class GetMacAddr    {            var $return_array = array(); // 返回帶有MAC地址的字串數組            var $mac_addr=array();                        function GetMacAddr()            {                 switch (strtolower(PHP_OS) )                    {                            case "linux":$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[] = $temp_array[0];                            }                    }                    unset($temp_array);                    return $this->mac_addr;            }               function forWindows()            {                    @exec("ipconfig /all", $this->return_array);                    if ( $this->return_array )                            return $this->return_array;                    else{                            $ipconfig = $_SERVER["WINDIR"]."\system32\ipconfig.exe";                            if ( is_file($ipconfig) )                               @exec($ipconfig." /all", $this->return_array);                            else                              @exec($_SERVER["WINDIR"]."\system\ipconfig.exe /all", $this->return_array);                            return $this->return_array;                    }            }               function forLinux()            {                    @exec("ifconfig -a", $this->return_array);                    return $this->return_array;            }    }       $mac = new GetMacAddr();   
print_r( $mac->mac_addr);    ?>