Using PHP's echo as a web service

[Aristidas]

It's way too much work to create a restful web service.Why can't we just create a simple php page which receives requests and simply echos the JSON string.for example:\[code\]<?php $action = $_POST['action']; if (action == "users") { //get all users from DB and echo a JSON string } else if (action = "ads") { //get all ads from DB and echo a JSON string } //etc ect?>\[/code\]