用PHP解析RSS / Atom提要的最佳方法

Question

我目前正在使用MagpieRSS，但是当RSS或Atom提要格式不正确时，有时会掉下来。还有其他使用PHP解析RSS和Atom提要的选项吗？

Answer 1

我一直使用PHP内置的SimpleXML函数来解析XML文档。它是目前为数不多的具有直观结构的通用解析器之一，这使得为RSS提要等特定内容构建有意义的类非常容易。此外，它将检测XML警告和错误，找到任何内容后，您可以简单地通过HTML Tidy（如ceejayoz所述）之类的源来运行源以对其进行清理并再次尝试。

考虑一下使用SimpleXML的非常粗糙，简单的类：

class BlogPost
{
    var $date;
    var $ts;
    var $link;

    var $title;
    var $text;
}

class BlogFeed
{
    var $posts = array();

    function __construct($file_or_url)
    {
        $file_or_url = $this->resolveFile($file_or_url);
        if (!($x = simplexml_load_file($file_or_url)))
            return;

        foreach ($x->channel->item as $item)
        {
            $post = new BlogPost();
            $post->date  = (string) $item->pubDate;
            $post->ts    = strtotime($item->pubDate);
            $post->link  = (string) $item->link;
            $post->title = (string) $item->title;
            $post->text  = (string) $item->description;

            // Create summary as a shortened body and remove images, 
            // extraneous line breaks, etc.
            $post->summary = $this->summarizeText($post->text);

            $this->posts[] = $post;
        }
    }

    private function resolveFile($file_or_url) {
        if (!preg_match('|^https?:|', $file_or_url))
            $feed_uri = $_SERVER['DOCUMENT_ROOT'] .'/shared/xml/'. $file_or_url;
        else
            $feed_uri = $file_or_url;

        return $feed_uri;
    }

    private function summarizeText($summary) {
        $summary = strip_tags($summary);

        // Truncate summary line to 100 characters
        $max_len = 100;
        if (strlen($summary) > $max_len)
            $summary = substr($summary, 0, $max_len) . '...';

        return $summary;
    }
}