Custom PHP code

Yes. Check the manual install in the FAQ

I was trying to set up the output method the way I need it. But I can not do anything. Could you give an example of what you need to wrap my code in order to display it?

What exactly are you trying to deliver. Is it a custom layout with the the related posts?

If so, take a look at this code of using the API.

https://gist.github.com/ajaydsouza/968b24a052e858bf8926