Folder access overriding url routing in php - php

Question

I am trying to write a PWA ready MVC framework in PHP. Controllers and Models are written in PHP, and the views are plain HTML assisted by AJAX.
So I started by building a URL routing class to manage requests. I also wrote a Session class, and it is working fine.
But my problem here is, I need some static HTML pages at the client side, for caching purposes. But I don’t want these files to be accessed without login. Let’s say I have a folder structure such as:
/ LIBS
/ route.php
/ Static
/ index.html
index.php
When I enter a URL like: mysite.com/foo/bar, routing class does the job and returns an array:
array (
0 => 'foo',
1 => 'bar',
)
That is good. But when I enter mysite.com/static it just goes into STATIC folder and brings index.html which is located inside that folder.
I want these files be accessed via php with Session control, after successful login. But I don’t want my visitors to access these files before logging in.
I tried to disable the access with htaccess, but this time I could not access them via PHP either.
Here is my index php:
<?php
include "/LIBS/route.php";
$route = new Route;
$route->init();
Here is my Router
<?php
class Route {
// Prints the URL array
public function init()
{
echo '<pre>' . var_export($this->_getUrl(), true) . '</pre>';
}
// gets the current URL and returns an array
private function _getUrl()
{
$url = isset($_GET['url']) ? $_GET['url'] : null;
$url = rtrim($url, '/');
$url = filter_var($url, FILTER_SANITIZE_URL);
$url = explode('/', $url);
return $url;
}
}
And here is my htaccess file
php_flag display_errors on
php_value error_reporting 9999
RewriteEngine On
RewriteBase /mvc/
# DirectoryIndex none.none
# Options -Indexes
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule ^(.+)$ index.php?url=$1 [QSA,L]
There is a kind of relevant SO question here which doesn't seem to be the answer to my question.
I digged everywhere but could not find an answer. What am I missing?
Thanks