core-bundle/src/Resources/contao/library/Contao/Feed.php
public function generateRss()
	{
		$this->adjustPublicationDate();

		$xml  = '<?xml version="1.0" encoding="' . Config::get('characterSet') . '"?>';
		$xml .= '<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom">';
		$xml .= '<channel>';
		$xml .= '<title>' . StringUtil::specialchars($this->title) . '</title>';
		$xml .= '<description>' . StringUtil::specialchars($this->description) . '</description>';
		$xml .= '<link>' . StringUtil::specialchars($this->link) . '</link>';
		$xml .= '<language>' . $this->language . '</language>';
		$xml .= '<pubDate>' . date('r', $this->published) . '</pubDate>';
		$xml .= '<generator>Contao Open Source CMS</generator>';
		$xml .= '<atom:link href="' . StringUtil::specialchars(Environment::get('base') . 'share/' . $this->strName) . '.xml" rel="self" type="application/rss+xml" />';

		foreach ($this->arrItems as $objItem)
		{
			$xml .= '<item>';
			$xml .= '<title>' . StringUtil::specialchars(strip_tags(StringUtil::stripInsertTags($objItem->title))) . '</title>';
			$xml .= '<description><![CDATA[' . preg_replace('/[\n\r]+/', ' ', $objItem->description) . ']]></description>';
			$xml .= '<link>' . StringUtil::specialchars($objItem->link) . '</link>';
			$xml .= '<pubDate>' . date('r', $objItem->published) . '</pubDate>';

			// Add the GUID
			if ($objItem->guid)
			{
				// Add the isPermaLink attribute if the guid is not a link (see #4930)
				if (strncmp($objItem->guid, 'http://', 7) !== 0 && strncmp($objItem->guid, 'https://', 8) !== 0)
				{
					$xml .= '<guid isPermaLink="false">' . $objItem->guid . '</guid>';
				}
				else
				{
					$xml .= '<guid>' . $objItem->guid . '</guid>';
				}
			}
			else
			{
				$xml .= '<guid>' . StringUtil::specialchars($objItem->link) . '</guid>';
			}

			// Enclosures
			if (\is_array($objItem->enclosure))
			{
				foreach ($objItem->enclosure as $arrEnclosure)
				{
					if (!empty($arrEnclosure['media']) && $arrEnclosure['media'] == 'media:content')
					{
						$xml .= '<media:content url="' . $arrEnclosure['url'] . '" type="' . $arrEnclosure['type'] . '" />';
					}
					else
					{
						$xml .= '<enclosure url="' . $arrEnclosure['url'] . '" length="' . $arrEnclosure['length'] . '" type="' . $arrEnclosure['type'] . '" />';
					}
				}
			}

			$xml .= '</item>';
		}

		$xml .= '</channel>';
		$xml .= '</rss>';

		return $xml;
	}
public function generateRss()
	{
		$this->adjustPublicationDate();

		$xml  = '<?xml version="1.0" encoding="' . Config::get('characterSet') . '"?>';
		$xml .= '<rss version="2.0" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom">';
		$xml .= '<channel>';
		$xml .= '<title>' . StringUtil::specialchars($this->title) . '</title>';
		$xml .= '<description>' . StringUtil::specialchars($this->description) . '</description>';
		$xml .= '<link>' . StringUtil::specialchars($this->link) . '</link>';
		$xml .= '<language>' . $this->language . '</language>';
		$xml .= '<pubDate>' . date('r', $this->published) . '</pubDate>';
		$xml .= '<generator>Contao Open Source CMS</generator>';
		$xml .= '<atom:link href="' . StringUtil::specialchars(Environment::get('base') . 'share/' . $this->strName) . '.xml" rel="self" type="application/rss+xml" />';

		foreach ($this->arrItems as $objItem)
		{
			$xml .= '<item>';
			$xml .= '<title>' . StringUtil::specialchars(strip_tags(StringUtil::stripInsertTags($objItem->title))) . '</title>';
			$xml .= '<description><![CDATA[' . preg_replace('/[\n\r]+/', ' ', $objItem->description) . ']]></description>';
			$xml .= '<link>' . StringUtil::specialchars($objItem->link) . '</link>';
			$xml .= '<pubDate>' . date('r', $objItem->published) . '</pubDate>';

			// Add the GUID
			if ($objItem->guid)
			{
				// Add the isPermaLink attribute if the guid is not a link (see #4930)
				if (strncmp($objItem->guid, 'http://', 7) !== 0 && strncmp($objItem->guid, 'https://', 8) !== 0)
				{
					$xml .= '<guid isPermaLink="false">' . $objItem->guid . '</guid>';
				}
				else
				{
					$xml .= '<guid>' . $objItem->guid . '</guid>';
				}
			}
			else
			{
				$xml .= '<guid>' . StringUtil::specialchars($objItem->link) . '</guid>';
			}

			// Enclosures
			if (\is_array($objItem->enclosure))
			{
				foreach ($objItem->enclosure as $arrEnclosure)
				{
					if (!empty($arrEnclosure['media']) && $arrEnclosure['media'] == 'media:content')
					{
						$xml .= '<media:content url="' . $arrEnclosure['url'] . '" type="' . $arrEnclosure['type'] . '" />';
					}
					else
					{
						$xml .= '<enclosure url="' . $arrEnclosure['url'] . '" length="' . $arrEnclosure['length'] . '" type="' . $arrEnclosure['type'] . '" />';
					}
				}
			}

			$xml .= '</item>';
		}

		$xml .= '</channel>';
		$xml .= '</rss>';

		return $xml;
	}
Generate an RSS 2.0 feed and return it as XML string

@return string The RSS feed markup