internship-playground/src-php/app/internship/controller/HelloController.php

<?php
namespace internship\controller;

//imports
use n2n\web\http\controller\ControllerAdapter;
use n2n\context\attribute\Inject;
//for post and put
use n2n\web\http\controller\ParamBody;
use n2n\web\http\PageNotFoundException;

Class HelloController extends ControllerAdapter {
    function getDoHello() {
        echo 'Hello World';
    }
}