In what language should I write a backend for a mobile application in React native?

Question

Backend

I know php, great experience. We recently developed a project and chose React native . I have never worked with react. Should I learn node js or use some other language. Thanks

Answer 1

The fact that the client is written in react native does not determine the backend language in any way.
Write on what will be more convenient for you to solve the tasks.
If, due to experience, it will be easier for you to do everything in php - take php