feed.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Feed extends CI_Controller {
  	
	function __construct() {
		  parent::__construct();
		  // load dependencies
		  $this->load->model('admin/articles_model', 'article');
		  $this->load->helper('xml');  
      $this->load->helper('text');
	}

	
	public function index( ){		
		  $data['feed_name'] = 'MyWebsite.com'; 
    	$data['encoding'] = 'utf-8';  
	    $data['feed_url'] = base_url().'common/feed'; 
	    $data['page_description'] = 'What my site is about comes here';  
	    $data['page_language'] = 'pt-pt'; 
	    $data['creator_email'] = '[email protected]';
	    $data['posts'] = $this->article->Get( array('status' => 'active') );  
	   
      header("Content-Type: application/rss+xml"); // important! 
	    $this->load->view('common/rss', $data);
	}
	
}

rss.php

<xml version="1.0" encoding="utf-8">
<rss version="2.0">
<channel>
  <title>{{ $feed_name }}</title>
	<link>{{ $feed_url }}</link>
	<description>{{ $page_description }}</description>
	<lastBuildDate>{{ date('D') }}, {{ date('d') }} {{ date('M') }} {{ date('Y') }} {{ date('G') }}: {{ date('i') }}:{{date('s')}} {{date('e') }}</lastBuildDate>
	<language>{{ $page_language }}</language>
	@foreach ($posts as $post)
		<item>
			<title>{{ $post->title }}</title>
			<link>{{ site_url('section/article/'. $post->id) }}</link>
			<guid>{{ site_url('section/article/'. $post->idarticle) }}</guid>
			<pubDate>{{ $post->articledate }} </pubDate>
			<description>[CDATA[ {{ character_limiter(strip_tags($post->intro, 200)) }} ]]</description>
		</item>
	@endforeach
</channel>
</rss>