private function logScriptOutput()
    {
        $output_buffers = array();
        $ob_cnt = 0;
        while (ob_get_level() > $this->output_buffer_level)
        {
            $output = trim(ob_get_contents());
            ++$ob_cnt;
            ob_end_clean();
            if (!empty($output))
            {
                $lines = explode("\n", $output);
                foreach ($lines as $n => $line)
                    self::$logger->debug("Script output: {0}/{1}: {2}", [$ob_cnt, $n + 1, $line]);
            }
        }
    }