protected function getEnvironmentVariables()
    {
        $env = array();

        foreach ($_SERVER as $name => $val) {
            if (is_array($val) || !in_array(strtolower($name), $this->getEnvironmentVariablesThatICareAbout())) {
                // In the future, this could be supported
                continue;
            }

            $env['env.'.$name] = $val;
        }

        return $env;
    }