<?php
use Rss\Rss;

$rss = new Rss('example.com rss', 'http://example.com', 'some description');
$rss->addItem(
    'one item',
    'http://example.com',
    'some description',
    new \DateTime('yesterday')
);

echo $rss->saveXML(); // rss xml
// $rss->output(); // send rss to browser