使用SimpleXML输出rss内容

代码说话。

    header('Content-Type: application/xml', true); //set document header content type to be XML

    $rss = new SimpleXMLExtendedModel('<rss xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom"></rss>');
    $rss->addAttribute('version', '2.0');

    $channel = $rss->addChild('channel'); //add channel node

    $atom = $channel->addChild('atom:atom:link');
    $atom->addAttribute('href', '你的RSS链接');
    $atom->addAttribute('rel', 'self');
    $atom->addAttribute('type', 'application/rss+xml');

    $channel->addChild('title', 'RSS标题');
    $description = $channel->addChild('description', 'RSS描述');
    $link = $channel->addChild('link', '你的RSS链接');
    $language = $channel->addChild('language', 'zh-Hans');

    $lastBuildDate = new DateTime($date . ' 02:00:00');
    $channel->addChild('lastBuildDate', $lastBuildDate->format(DateTime::RSS));
    $channel->addChild('pubDate', $lastBuildDate->format(DateTime::RSS));

    $generator = $channel->addChild('generator', '创建者');

    // $result 为数据库查询结果
    foreach ($result as $data) {

        $item = $channel->addChild('item');
        $item->addChild('title', 'item的标题');
        $link = $item->addChild('link', 'item的链接');
        $guid = $item->addChild('guid', 'item的链接');
        $guid->addAttribute('isPermaLink', 'true');

        $item->addChild('description')->addCData('item的描述');

        $item = $item->addChild('pubDate', $lastBuildDate->format(DateTime::RSS)); //add pubDate node
    }

    echo $rss->asXML();

期间遇到CDATA的问题，解决方案新增一个扩展类。

class SimpleXMLExtendedModel extends SimpleXMLElement {

    public function addCData($cdata_text) {

        $node= dom_import_simplexml($this);
        $no = $node->ownerDocument;
        $node->appendChild($no->createCDATASection($cdata_text));

        return true;
    }
}