How to correctly specify links in the menu?

Question

PHP

Good evening!
I created a menu, it lies in the header of the site in the header.php file, which I connect to each page through - require_once("includes/header.php");
And now the next problem is when I am on the main page - localhost/app/index.php
And now if I click on the link for example news, the request address is such
localhost/pages/news.php - and accordingly it turns out that there is no such page since the real address localhost/app/pages/news.php
How to do it right?

Answer 1

And now if I click on a link, for example news, the request address is like this

depending on which link, if it is /pages/news.php, then naturally it builds from the domain. Remove the app, why do you need it?