public static function earlyExceptionVersion()
    {
        $message = <<<EOM
Bolt requires PHP <u>5.5.9</u>, or higher. 
<br><br>
You are running PHP <u>%s</u>, so Bolt will not run on your current setup.
EOM;
        $message = sprintf($message, htmlspecialchars(PHP_VERSION, ENT_QUOTES));

        echo sprintf(static::getEarlyExceptionHtml(), 'Bolt - Fatal error', $message, '');

        throw new static(strip_tags($message));
    }