How to open a specific page from another folder?

Question

PHP

Hello.
I have a site in Russian, and I translated this site into English and added it to the /En folder .

The site has a header that has a language switcher. And now the question is - I'm on the page /o_nas.php and when I click on the switch to English in the header, I need to open this page (and not just go to the En folder), that is, to open the page /o_nas.php page /about.php .
How to do it?
PS I understand that perhaps this approach is not correct, but we need to get out of what we have

Answer 1

$_SERVER['REQUEST_URI'] + header