how create a rest full api in php

[Marcel187]

The issue is this: I have a web application that runs on a PHP server. I'd like to build a REST api for it.I did some research and I figured out that REST api uses HTTP methods (GET, POST...) for certain URI's with an authentication key (not necessarily) and the information is presented back as a HTTP response with the info as XML or JSON (I'd rather JSON).My question is: 1. How do I, as the developer of the app, build those URI's? Do I need to write a PHP code at that URI?2. How do I build the JSON objects to return as a response?I hope I was clear enough.Thanks!