rss2.php

<?php

class RSS2 {

	private $channel = array();
	private $item = array();

	public function setTitle($value) {
		$this->channel['title'] = $value;
	}

	public function setLink($value) {
		$this->channel['link'] = $value;
	}

	public function setDescription($value) {
		$this->channel['description'] = $value;
	}

	public function setLanguage($value) {
		$this->channel['language'] = $value;
	}

	public function setLastBuildDate($value) {
		$this->channel['lastBuildDate'] = $this->toRFC822($value);
	}

	public function setItem($title, $link, $description, $pubDate) {
		$this->item[] = array(
			'title'       => $title,
			'link'        => $link,
			'description' => $description,
			'pubDate'     => $this->toRFC822($pubDate),
			'guid'        => $link,
		);
	}

	public function output() {
		$dom = new DomDocument('1.0', 'UTF-8');
		$rssNode = $dom->appendChild($dom->createElement('rss'));
		$rssNode->setAttribute('version', '2.0');
		$channelNode = $rssNode->appendChild($dom->createElement('channel'));

		foreach ($this->channel as $key => $value) {
			$channelNode->appendChild($dom->createElement($key, $value));
		}

		foreach ($this->item as $item) {
			$itemNode = $channelNode->appendChild($dom->createElement('item'));
			foreach ($item as $key => $value) {
				$itemNode->appendChild($dom->createElement($key, $value));
			}
		}

		$dom->formatOutput = true;

		return $dom->saveXML();
	}

	private function toRFC822($value) {
		return (string)date(DATE_RFC2822, strtotime($value));
	}
}