CNC rewrite nesting: how?

Question

PHP

Good afternoon!
There are urls like:
site.ru/catalog/razdel/1.php
site.ru/catalog/folder/2.php
site.ru/folder/papka/3.php
How to convert to a link like:
site.ru/2.php
site.ru/1.php
The sections are different, how can I do it without a database? But at the same time, you need to know which directory the page belongs to.

Answer 1

.htaccess

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule .* index.php

index.php

$requestedString = explode('?', getenv('REQUEST_URI'));
$requestedString = $requestedString[0];

Well, you can manipulate it however you want. Any nesting level. Use any masks and regular expressions to get the data you need.