ElggInstaller::getBaseUrl PHP Method

    protected function getBaseUrl()
    {
        $protocol = $this->isHttps() ? 'https' : 'http';
        if (isset($_SERVER["SERVER_PORT"])) {
            $port = ':' . $_SERVER["SERVER_PORT"];
        } else {
            $port = '';
        }
        if ($port == ':80' || $port == ':443') {
            $port = '';
        }
        $uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';
        $cutoff = strpos($uri, 'install.php');
        $uri = substr($uri, 0, $cutoff);
        $serverName = isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '';
        return "{$protocol}://{$serverName}{$port}{$uri}";
    }