用 PHP 解析 RSS/Atom 提要的最佳方法
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Best way to parse RSS/Atom feeds with PHP
提问by carson
I'm currently using Magpie RSSbut it sometimes falls over when the RSS or Atom feed isn't well formed. Are there any other options for parsing RSS and Atom feeds with PHP?
我目前正在使用Magpie RSS，但是当 RSS 或 Atom 提要格式不正确时，它有时会失败。是否有其他选项可以使用 PHP 解析 RSS 和 Atom 提要？
采纳答案by Philip Morton
Your other options include:
您的其他选择包括：
回答by Brian Cline
I've always used the SimpleXML functions built in to PHPto parse XML documents. It's one of the few generic parsers out there that has an intuitive structure to it, which makes it extremely easy to build a meaningful class for something specific like an RSS feed. Additionally, it will detect XML warnings and errors, and upon finding any you could simply run the source through something like HTML Tidy (as ceejayoz mentioned) to clean it up and attempt it again.
我一直使用PHP 内置的 SimpleXML 函数来解析 XML 文档。它是少数具有直观结构的通用解析器之一，这使得为特定内容（如 RSS 提要）构建有意义的类变得非常容易。此外，它会检测 XML 警告和错误，一旦发现任何错误，您可以简单地通过 HTML Tidy（如 ceejayoz 提到的）之类的东西运行源代码来清理它并再次尝试。
Consider this very rough, simple class using SimpleXML:
考虑这个使用 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;
}
}
回答by PJunior
With 4 lines, I import a rss to an array.
用 4 行，我将一个 rss 导入到一个数组中。
$feed = implode(file('http://yourdomains.com/feed.rss'));
$xml = simplexml_load_string($feed);
$json = json_encode($xml);
$array = json_decode($json,TRUE);
For a more complex solution
对于更复杂的解决方案
$feed = new DOMDocument();
$feed->load('file.rss');
$json = array();
$json['title'] = $feed->getElementsByTagName('channel')->item(0)->getElementsByTagName('title')->item(0)->firstChild->nodeValue;
$json['description'] = $feed->getElementsByTagName('channel')->item(0)->getElementsByTagName('description')->item(0)->firstChild->nodeValue;
$json['link'] = $feed->getElementsByTagName('channel')->item(0)->getElementsByTagName('link')->item(0)->firstChild->nodeValue;
$items = $feed->getElementsByTagName('channel')->item(0)->getElementsByTagName('item');
$json['item'] = array();
$i = 0;
foreach($items as $key => $item) {
$title = $item->getElementsByTagName('title')->item(0)->firstChild->nodeValue;
$description = $item->getElementsByTagName('description')->item(0)->firstChild->nodeValue;
$pubDate = $item->getElementsByTagName('pubDate')->item(0)->firstChild->nodeValue;
$guid = $item->getElementsByTagName('guid')->item(0)->firstChild->nodeValue;
$json['item'][$key]['title'] = $title;
$json['item'][$key]['description'] = $description;
$json['item'][$key]['pubdate'] = $pubDate;
$json['item'][$key]['guid'] = $guid;
}
echo json_encode($json);
回答by Vladimir Lukyanov
I would like introduce simple script to parse RSS:
我想介绍一个简单的脚本来解析 RSS：
$i = 0; // counter
$url = "http://www.banki.ru/xml/news.rss"; // url to parse
$rss = simplexml_load_file($url); // XML parser
// RSS items loop
print '<h2><img style="vertical-align: middle;" src="'.$rss->channel->image->url.'" /> '.$rss->channel->title.'</h2>'; // channel title + img with src
foreach($rss->channel->item as $item) {
if ($i < 10) { // parse only 10 items
print '<a href="'.$item->link.'">'.$item->title.'</a><br />';
}
$i++;
}
回答by Kornel
回答by ceejayoz
The HTML Tidy library is able to fix some malformed XML files. Running your feeds through that before passing them on to the parser may help.
HTML Tidy 库能够修复一些格式错误的 XML 文件。在将它们传递给解析器之前通过它运行您的提要可能会有所帮助。
回答by ceejayoz
I use SimplePieto parse a Google Reader feed and it works pretty well and has a decent feature set.
我使用SimplePie来解析 Google 阅读器提要，它运行良好并且具有不错的功能集。
Of course, I haven't tested it with non-well-formed RSS / Atom feeds so I don't know how it copes with those, I'm assuming Google's are fairly standards compliant! :)
当然，我还没有用格式不正确的 RSS / Atom 提要对其进行测试，所以我不知道它是如何处理这些的，我假设 Google 是相当符合标准的！:)
回答by Adam
Personally I use BNC Advanced Feed Parser- i like the template system that is very easy to use
我个人使用 BNC Advanced Feed Parser - 我喜欢非常易于使用的模板系统
回答by Thinol
The PHP RSS reader - http://www.scriptol.com/rss/rss-reader.php- is a complete but simple parser used by thousand of users...
PHP RSS 阅读器 - http://www.scriptol.com/rss/rss-reader.php- 是一个完整但简单的解析器，被数千名用户使用...
回答by Lucas
Another great free parser - http://bncscripts.com/free-php-rss-parser/It's very light ( only 3kb ) and simple to use!
另一个很棒的免费解析器 - http://bncscripts.com/free-php-rss-parser/它非常轻巧（只有 3kb）且易于使用！
