Think\Log\Driver\Socket::getClientArg PHP Метод

    protected function getClientArg($name)
    {
        static $args = [];
        $key = 'HTTP_USER_AGENT';
        if (isset($_SERVER['HTTP_SOCKETLOG'])) {
            $key = 'HTTP_SOCKETLOG';
        }
        if (!isset($_SERVER[$key])) {
            return null;
        }
        if (empty($args)) {
            if (!preg_match('/SocketLog\\((.*?)\\)/', $_SERVER[$key], $match)) {
                $args = ['tabid' => null];
                return null;
            }
            parse_str($match[1], $args);
        }
        if (isset($args[$name])) {
            return $args[$name];
        }
        return null;
    }