使用 php 动态添加 RSS 提要

Question

我在数据库中有一组文章，我想使用 xml 格式将它们的内容添加到位于我名为 rss.xml 的项目中的文件中。这是来自 https://developers.facebook.com/docs/instant-articles/publishing/setup-rss-feed 的 xml 文件。

<rss version="2.0"
xmlns:content="http://purl.org/rss/1.0/modules/content/">
  <channel>
    <title>News Publisher</title>
    <link>http://www.example.com/</link>
    <description>
      Read our awesome news, every day.
    </description>
    <language>en-us</language>
    <lastBuildDate>2014-12-11T04:44:16Z</lastBuildDate>
    <item>
      <title>This is an Instant Article</title>
      <link>http://example.com/article.html</link>
      <guid>2fd4e1c67a2d28fced849ee1bb76e7391b93eb12</guid>
      <pubDate>2014-12-11T04:44:16Z</pubDate>
      <author>Mr. Author</author>
      <description>This is my first Instant Article. How awesome is this?</description>
      <content:encoded>

        <!doctype html>
        <html lang="en" prefix="op: http://media.facebook.com/op#">
          <head>
            <meta charset="utf-8">
            <link rel="canonical" href="http://example.com/article.html">
            <meta property="op:markup_version" content="v1.0">
          </head>
          <body>
            <article>
              <header>
                <!— Article header goes here -->
              </header>

              <!— Article body goes here -->

              <footer>
                <!— Article footer goes here -->
              </footer>
            </article>
          </body>
        </html>

      </content:encoded>
    </item>
  </channel>
</rss>

这是我的 php:

$crud = new ArticleController();
$file = 'rss.xml'; //open the file
$xml = simplexml_load_file($file);
$channel = $xml->channel; //get channel to add item to
$list=$crud->getAll();  //Returns all articles in database
$item = $channel->addChild('item');
$item->addChild('title', 'a gallery');
$item->addChild('pubDate', '12/12/2017');
$item->addChild('description', 'something');
$content = $item->addChild('content:encoded');
$html = $content->addChild('html');
$xml->asXML($file); //write to file

我不会走得太远，因为我的代码已经返回了很多警告和错误，例如：

Warning: simplexml_load_file(): rss.xml:25: parser error : Opening and ending tag mismatch: meta line 24 and head in file.php on line 153

Fatal error: Call to a member function children() on a non-object in /var/www/html/pfe2017/controller/ArticleController.php on line 156

谁能帮忙解释一下如何通过提供示例来实现预期的结果？

Answer 1

根据RSS Feeds for Instant Articles：

Remember to escape all HTML content by wrapping it within a CDATA section.

所以，只需将 content:encoded 的 HTML 内容用 <![CDATA[ 和 ]]>:

包裹起来

<content:encoded><![CDATA[
    <!doctype html>
    ...
    </html>
]]></content:encoded>

还有：

$content = $item->addChild('content:encoded');
$html = $content->addChild('html');

上面的代码产生以下 XML：<encoded><html/></encoded>

用类似下面的内容更改这些行：

$content = $item->addChild('content:encoded', null, 'http://purl.org/rss/1.0/modules/content/');
$base = dom_import_simplexml($content);
$docOwner = $base->ownerDocument;
$base->appendChild($docOwner->createCDATASection('<html>Some HTML</html>'));

生成以下有效的 XML 元素：

<content:encoded><![CDATA[<html>Some HTML</html>]]></content:encoded>

请参考：

How to write CDATA using SimpleXmlElement?
SimpleXMLElement::addChild

Answer 2

我自己解决了这里是下面的代码：

    $rssfeed = '<?xml version="1.0" encoding="ISO-8859-1"?>';
    $rssfeed .= '<rss version="2.0">';
    $rssfeed .= '<channel>';
    $rssfeed .= '<title>My RSS feed</title>';
    $rssfeed .= '<link>my link</link>';
    $rssfeed .= '<description>something</description>';
    $rssfeed .= '<language>en-us</language>';
    $rssfeed .= '<copyright>Copyright (C) 2017</copyright>';

    foreach ($list as $l) {
        $rssfeed .= '<item>';
        $rssfeed .= '<title>' . $l['titre'] . '</title>';
        $rssfeed .= '<description>' . $l['contenu'] . '</description>';
        $rssfeed .= '<link>' . "my link" . '</link>';
        $rssfeed .= '<pubDate>' . date("D, d M Y H:i:s O", strtotime($l['date_de_creation'])) . '</pubDate>';
        $rssfeed .= '</item>';
    }
    $rssfeed .= '</channel>';
    $rssfeed .= '</rss>';
    $handle = fopen("../rss.xml", "w+");
    fclose($handle);
    $myfile = fopen("../rss.xml", "w");
    fwrite($myfile, $rssfeed);
    fclose($myfile);

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