Problems with language selection based on application when developing the web

We are developing a web app with node.js.

By the way, the logic of crawling and getting data should be included.

I found out that php language is much more stable than node.js.

So it is said that there is a method of developing php or node.js+php.

Are there many cases of developing the backend in two languages??

Please feel free to reply to me about it.