protected function cpu_info()
    {

        $this->cpu_info = array();
        if (!stristr(PHP_OS, 'win')) {
            exec("cat /proc/cpuinfo", $output);
            foreach ($output as $line) {
                $parts = explode(':', $line);

                if (empty($parts[0])) continue;

                $this->cpu_info[trim($parts[0])] = (!empty($parts[1])) ? trim($parts[1]) : null;
            }
        }

        return true;
    }