How to modify seo url for virtual pages?

Question

opencart

The second day I struggle with the question:
There is a standard opencart assembly. There was a need to make virtual pages in the product catalog. Without seo pro, everything is set up normally, but it’s worth turning it on and no tricks can save it - it says page not found. Maybe someone has already done something similar? Normal url:

http://site.ru/category/subcategory/product?product_id

I need to achieve something like this:

http://site.ru/category/subcategory/product?product_id/1

Any hints are welcome!

Answer 1

This check is likely to interfere with you:
if (count($rows) == sizeof($parts)) {