rss-bridge/formats/MrssFormat.php

<?php
/**
* Mrss
* Documentation Source http://www.rssboard.org/media-rss
*/
class MrssFormat extends FormatAbstract {
	public function stringify(){
		$https = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '';
		$httpHost = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
		$httpInfo = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';

		$serverRequestUri = isset($_SERVER['REQUEST_URI']) ? $this->xml_encode($_SERVER['REQUEST_URI']) : '';

		$extraInfos = $this->getExtraInfos();
		$title = $this->xml_encode($extraInfos['name']);

		if(!empty($extraInfos['uri'])) {
			$uri = $this->xml_encode($extraInfos['uri']);
		} else {
			$uri = REPOSITORY;
		}

		$uriparts = parse_url($uri);
		$icon = $this->xml_encode($uriparts['scheme'] . '://' . $uriparts['host'] . '/favicon.ico');

		$items = '';
		foreach($this->getItems() as $item) {
			$itemAuthor = $this->xml_encode($item->getAuthor());
			$itemTitle = $this->xml_encode($item->getTitle());
			$itemUri = $this->xml_encode($item->getURI());
			$itemTimestamp = $this->xml_encode(date(DATE_RFC2822, $item->getTimestamp()));
			$itemContent = $this->xml_encode($this->sanitizeHtml($item->getContent()));

			$entryEnclosuresWarning = '';
			$entryEnclosures = '';
			if(!empty($item->getEnclosures())) {
				$entryEnclosures .= '<enclosure url="'
				. $this->xml_encode($item->getEnclosures()[0])
				. '" type="' . getMimeType($item->getEnclosures()[0]) . '" />';

				if(count($item->getEnclosures()) > 1) {
					$entryEnclosures .= PHP_EOL;
					$entryEnclosuresWarning = '&lt;br&gt;Warning:
Some media files might not be shown to you. Consider using the ATOM format instead!';
					foreach($item->getEnclosures() as $enclosure) {
						$entryEnclosures .= '<atom:link rel="enclosure" href="'
						. $enclosure . '" type="' . getMimeType($enclosure) . '" />'
						. PHP_EOL;
					}
				}
			}

			$entryCategories = '';
			foreach($item->getCategories() as $category) {
				$entryCategories .= '<category>'
				. $category . '</category>'
				. PHP_EOL;
			}

			$items .= <<<EOD

	<item>
		<title>{$itemTitle}</title>
		<link>{$itemUri}</link>
		<guid isPermaLink="true">{$itemUri}</guid>
		<pubDate>{$itemTimestamp}</pubDate>
		<description>{$itemContent}{$entryEnclosuresWarning}</description>
		<author>{$itemAuthor}</author>
		{$entryEnclosures}
		{$entryCategories}
	</item>

EOD;
		}

		$charset = $this->getCharset();

		/* xml attributes need to have certain characters escaped to be w3c compliant */
		$imageTitle = htmlspecialchars($title, ENT_COMPAT);
		/* Data are prepared, now let's begin the "MAGIE !!!" */
		$toReturn = <<<EOD
<?xml version="1.0" encoding="{$charset}"?>
<rss version="2.0"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:media="http://search.yahoo.com/mrss/"
xmlns:atom="http://www.w3.org/2005/Atom">
	<channel>
		<title>{$title}</title>
		<link>http{$https}://{$httpHost}{$httpInfo}/</link>
		<description>{$title}</description>
		<image url="{$icon}" title="{$imageTitle}" link="{$uri}"/>
		<atom:link rel="alternate" type="text/html" href="{$uri}" />
		<atom:link rel="self" href="http{$https}://{$httpHost}{$serverRequestUri}" />
		{$items}
	</channel>
</rss>
EOD;

		// Remove invalid non-UTF8 characters
		ini_set('mbstring.substitute_character', 'none');
		$toReturn = mb_convert_encoding($toReturn, $this->getCharset(), 'UTF-8');
		return $toReturn;
	}

	public function display(){
		$this
			->setContentType('application/rss+xml; charset=' . $this->getCharset())
			->callContentType();

		return parent::display();
	}

	private function xml_encode($text){
		return htmlspecialchars($text, ENT_XML1);
	}
}