How to use React without a router?

Question

PHP

Hello.
There is a project written in PHP. The customer wants to attach React to it.
Having two routers (on the backend and frontend) I think is at least a strange undertaking.
What options?

Answer 1

Does the customer want? Does the customer understand what it is and why it is needed? Or did he see the article "how to make a hype site with blackjack and young ladies"?) And is he also aware of the question of indexing by search engines?

Answer 2

it’s just that the url will not change, but there will be many conditions in one component what exactly needs to be rendered