function node_feed

Generates and prints an RSS feed.

Generates an RSS feed from an array of node IDs, and prints it with an HTTP header, with Content Type set to RSS/XML.

Parameters

$nids: An array of node IDs (nid). Defaults to FALSE so empty feeds can be generated with passing an empty array, if no items are to be added to the feed.

$channel: An associative array containing title, link, description and other keys, to be parsed by format_rss_channel() and format_xml_elements(). A list of channel elements can be found at the RSS 2.0 Specification. The link should be an absolute URL.

File

modules/node/node.module, line 2575

Code

function node_feed($nids = FALSE, $channel = array()) {
    global $base_url, $language_content;
    if ($nids === FALSE) {
        $nids = db_select('node', 'n')->fields('n', array(
            'nid',
            'created',
        ))
            ->condition('n.promote', 1)
            ->condition('n.status', 1)
            ->orderBy('n.created', 'DESC')
            ->range(0, variable_get('feed_default_items', 10))
            ->addTag('node_access')
            ->execute()
            ->fetchCol();
    }
    $item_length = variable_get('feed_item_length', 'fulltext');
    $namespaces = array(
        'xmlns:dc' => 'http://purl.org/dc/elements/1.1/',
    );
    // Load all nodes to be rendered.
    $nodes = node_load_multiple($nids);
    $items = '';
    foreach ($nodes as $node) {
        $item_text = '';
        $node->link = url("node/{$node->nid}", array(
            'absolute' => TRUE,
        ));
        $node->rss_namespaces = array();
        $account = user_load($node->uid);
        $node->rss_elements = array(
            array(
                'key' => 'pubDate',
                'value' => gmdate('r', $node->created),
            ),
            array(
                'key' => 'dc:creator',
                'value' => format_username($account),
            ),
            array(
                'key' => 'guid',
                'value' => $node->nid . ' at ' . $base_url,
                'attributes' => array(
                    'isPermaLink' => 'false',
                ),
            ),
        );
        // The node gets built and modules add to or modify $node->rss_elements
        // and $node->rss_namespaces.
        $build = node_view($node, 'rss');
        unset($build['#theme']);
        if (!empty($node->rss_namespaces)) {
            $namespaces = array_merge($namespaces, $node->rss_namespaces);
        }
        if ($item_length != 'title') {
            // We render node contents and force links to be last.
            $build['links']['#weight'] = 1000;
            $item_text .= drupal_render($build);
        }
        $items .= format_rss_item($node->title, $node->link, $item_text, $node->rss_elements);
    }
    $channel_defaults = array(
        'version' => '2.0',
        'title' => variable_get('site_name', 'Drupal'),
        'link' => $base_url,
        'description' => variable_get('feed_description', ''),
        'language' => $language_content->language,
    );
    $channel_extras = array_diff_key($channel, $channel_defaults);
    $channel = array_merge($channel_defaults, $channel);
    $output = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n";
    $output .= "<rss version=\"" . $channel["version"] . "\" xml:base=\"" . $base_url . "\" " . drupal_attributes($namespaces) . ">\n";
    $output .= format_rss_channel($channel['title'], $channel['link'], $channel['description'], $items, $channel['language'], $channel_extras);
    $output .= "</rss>\n";
    drupal_add_http_header('Content-Type', 'application/rss+xml; charset=utf-8');
    print $output;
}