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 = $this->xml_encode($_SERVER['REQUEST_URI']);

        $extraInfos = $this->getExtraInfos();
        $title = $this->xml_encode($extraInfos['name']);
        $uri = $this->xml_encode(!empty($extraInfos['uri']) ? $extraInfos['uri'] : 'https://github.com/sebsauvage/rss-bridge');

        $items = '';
        foreach($this->getItems() as $item){
            $itemAuthor = isset($item['author']) ? $this->xml_encode($item['author']) : '';
            $itemTitle = strip_tags(isset($item['title']) ? $this->xml_encode($item['title']) : '');
            $itemUri = isset($item['uri']) ? $this->xml_encode($item['uri']) : '';
            $itemTimestamp = isset($item['timestamp']) ? $this->xml_encode(date(DATE_RFC2822, $item['timestamp'])) : '';
            $itemContent = isset($item['content']) ? $this->xml_encode($this->sanitizeHtml($item['content'])) : '';
            $items .= <<<EOD

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

EOD;
        }

        /* Data are prepared, now let's begin the "MAGIE !!!" */
        $toReturn  = '<?xml version="1.0" encoding="UTF-8"?>';
        $toReturn .= <<<EOD
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <title>{$title}</title>
        <link>http{$https}://{$httpHost}{$httpInfo}/</link>
        <description>{$title}</description>
        <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, 'UTF-8', 'UTF-8');
        return $toReturn;
    }

    public function display(){
        $this
            ->setContentType('application/rss+xml; charset=UTF-8')
            ->callContentType();

        return parent::display();
    }

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