Helper class for creating an Atom feed

PHP: AtomFeed

class AtomFeed
{
	private $xml;

	function __construct()
	{
		$this->xml = new SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?><feed xmlns="http://www.w3.org/2005/Atom" />');
	}

	function setFeedHeader($title, $uri, $updated, $author_name, $author_email, $author_uri)
	{
		$this->xml->addChild("id", $uri);
		$this->xml->addChild("title", $title);
		$this->xml->addChild("updated", $updated);
		$atomlink = $this->xml->addChild("link");
		$atomlink->addAttribute("href", $uri);
		$atomlink->addAttribute("rel", "self");
		$author = $this->xml->addChild("author");
		$author->addChild("name", $author_name);
		$author->addChild("email", $author_email);
		$author->addChild("uri", $author_uri);
	}

	function pushEntry($title, $uri, $summary, $updated)
	{
		$entry = $this->xml->addChild("entry");
		$entry->addChild("id", $uri);
		$entry->addChild("title", $title);
		$summary = $entry->addChild("summary", $summary);
		$summary->addAttribute("type", "html");
		$entry->addChild("updated", $updated);
		$link = $entry->addChild("link");
		$link->addAttribute("href", $uri);
	}

	function output()
	{
		header("Content-Type: application/atom+xml");
		echo $this->xml->asXML();
	}

	function save($path)
	{
		file_put_contents($path, $this->xml->asXML());
	}
}