Craft\InstantAnalyticsPlugin::onBeforeInstall PHP Method

    public function onBeforeInstall()
    {
        $result = true;
        if (version_compare(PHP_VERSION, '5.5', '<')) {
            $result = false;
            $error = "Instant Analytics requires php 5.5.0 or later to operate";
            if (version_compare(craft()->getVersion(), '2.5', '<')) {
                throw new Exception($error);
            } else {
                craft()->userSession->setError($error);
            }
        }
        return $result;
    }