rss.php

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        if (isset($array->itunes->author)) {
            $author = $array->itunes->author;
        } elseif (isset($array->author)) {
            $author = $array->author;
        }
        if (!empty($author)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:author', $author);
            $root->appendChild($node);
        }

        /* owner node */
        $author = '';
        $email = '';
        if (isset($array->itunes->owner)) {
            if (isset($array->itunes->owner['name'])) {
                $author = $array->itunes->owner['name'];
            }
            if (isset($array->itunes->owner['email'])) {
                $email = $array->itunes->owner['email'];
            }
        }
        if (empty($author) && isset($array->author)) {
            $author = $array->author;
        }
        if (empty($email) && isset($array->email)) {
            $email = $array->email;
        }
        if (!empty($author) || !empty($email)) {
            $owner = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:owner');
            if (!empty($author)) {
                $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:name', $author);
                $owner->appendChild($node);
            }
            if (!empty($email)) {
                $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:email', $email);
                $owner->appendChild($node);
            }
            $root->appendChild($owner);
        }
        $image = '';
        if (isset($array->itunes->image)) {
            $image = $array->itunes->image;
        } elseif (isset($array->image)) {
            $image = $array->image;
        }
        if (!empty($image)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:image');
            $node->setAttribute('href', $image);
            $root->appendChild($node);
        }
        $subtitle = '';
        if (isset($array->itunes->subtitle)) {
            $subtitle = $array->itunes->subtitle;
        } elseif (isset($array->description)) {
            $subtitle = $array->description;
        }
        if (!empty($subtitle)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:subtitle', $subtitle);
            $root->appendChild($node);
        }
        $summary = '';
        if (isset($array->itunes->summary)) {
            $summary = $array->itunes->summary;
        } elseif (isset($array->description)) {
            $summary = $array->description;
        }
        if (!empty($summary)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:summary', $summary);
            $root->appendChild($node);
        }
        if (isset($array->itunes->block)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:block', $array->itunes->block);
            $root->appendChild($node);
        }
        if (isset($array->itunes->explicit)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:explicit', $array->itunes->explicit);
            $root->appendChild($node);
        }
        if (isset($array->itunes->keywords)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:keywords', $array->itunes->keywords);
            $root->appendChild($node);
        }
        if (isset($array->itunes->new_feed_url)) {
            $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:new-feed-url', $array->itunes->new_feed_url);
            $root->appendChild($node);
        }
        if (isset($array->itunes->category)) {
            foreach ($array->itunes->category as $i => $category) {
                $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:category');
                $node->setAttribute('text', $category['main']);
                $root->appendChild($node);
                $add_end_category = false;
                if (!empty($category['sub'])) {
                    $add_end_category = true;
                    $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:category');
                    $node->setAttribute('text', $category['sub']);
                    $root->appendChild($node);
                }
                if ($i > 0 || $add_end_category) {
                    $node = $this->_element->createElementNS('http://www.itunes.com/DTDs/Podcast-1.0.dtd', 'itunes:category');
                    $root->appendChild($node);
                }
            }
        }
    }

    /**
     * Generate the entries of the feed when working in write mode
     *
     * The following nodes are constructed for each feed entry
     * <item>
     *    <title>entry title</title>
     *    <link>url to feed entry</link>
     *    <guid>url to feed entry</guid>
     *    <description>short text</description>
     *    <content:encoded>long version, can contain html</content:encoded>
     * </item>
     *
     * @param  DOMElement $root the root node to use
     * @param  array $array the data to use
     * @return void
     */
    protected function _mapFeedEntries(DOMElement $root, $array)
    {
        Zend_Feed::registerNamespace('content', 'http://purl.org/rss/1.0/modules/content/');

        foreach ($array as $dataentry) {
            $item = $this->_element->createElement('item');

            $title = $this->_element->createElement('title');
            $title->appendChild($this->_element->createCDATASection($dataentry->title));
            $item->appendChild($title);

            $link = $this->_element->createElement('link', $dataentry->link);
            $item->appendChild($link);

            if (isset($dataentry->guid)) {
                $guid = $this->_element->createElement('guid', $dataentry->guid);
                $item->appendChild($guid);
            }

            $description = $this->_element->createElement('description');
            $description->appendChild($this->_element->createCDATASection($dataentry->description));
            $item->appendChild($description);

            if (isset($dataentry->content)) {
                $content = $this->_element->createElement('content:encoded');
                $content->appendChild($this->_element->createCDATASection($dataentry->content));
                $item->appendChild($content);
            }

            $pubdate = isset($dataentry->lastUpdate) ? $dataentry->lastUpdate : time();
            $pubdate = $this->_element->createElement('pubDate', gmdate('r', $pubdate));
            $item->appendChild($pubdate);

            if (isset($dataentry->category)) {
                foreach ($dataentry->category as $category) {
                    $node = $this->_element->createElement('category', $category['term']);
                    if (isset($category['scheme'])) {
                        $node->setAttribute('domain', $category['scheme']);
                    }
                    $item->appendChild($node);
                }
            }

            if (isset($dataentry->source)) {
                $source = $this->_element->createElement('source', $dataentry->source['title']);
                $source->setAttribute('url', $dataentry->source['url']);
                $item->appendChild($source);
            }

            if (isset($dataentry->comments)) {
                $comments = $this->_element->createElement('comments', $dataentry->comments);
                $item->appendChild($comments);
            }
            if (isset($dataentry->commentRss)) {
                $comments = $this->_element->createElementNS('http://wellformedweb.org/CommentAPI/',
                                                             'wfw:commentRss',
                                                             $dataentry->commentRss);
                $item->appendChild($comments);
            }


            if (isset($dataentry->enclosure)) {
                foreach ($dataentry->enclosure as $enclosure) {
                    $node = $this->_element->createElement('enclosure');
                    $node->setAttribute('url', $enclosure['url']);
                    if (isset($enclosure['type'])) {
                        $node->setAttribute('type', $enclosure['type']);
                    }
                    if (isset($enclosure['length'])) {
                        $node->setAttribute('length', $enclosure['length']);
                    }
                    $item->appendChild($node);
                }
            }

            $root->appendChild($item);
        }
    }

    /**
     * Override Zend_Feed_Element to include <rss> root node
     *
     * @return string
     */
    public function saveXml()
    {
        // Return a complete document including XML prologue.
        $doc = new DOMDocument($this->_element->ownerDocument->version,
                               $this->_element->ownerDocument->actualEncoding);
        $root = $doc->createElement('rss');

        // Use rss version 2.0
        $root->setAttribute('version', '2.0');

        // Content namespace
        $root->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:content', 'http://purl.org/rss/1.0/modules/content/');
        $root->appendChild($doc->importNode($this->_element, true));

        // Append root node
        $doc->appendChild($root);

        // Format output
        $doc->formatOutput = true;

        return $doc->saveXML();
    }

    /**
     * Send feed to a http client with the correct header
     *
     * @return void
     * @throws Zend_Feed_Exception if headers have already been sent
     */
    public function send()
    {
        if (headers_sent()) {
            /** 
             * @see Zend_Feed_Exception
             */
            require_once 'Zend/Feed/Exception.php';
            throw new Zend_Feed_Exception('Cannot send RSS because headers have already been sent.');
        }

        header('Content-type: application/rss+xml; charset: ' . $this->_element->ownerDocument->actualEncoding);

        echo $this->saveXml();
    }

}