使用DomDocument获取RSS提要，但遇到了一个奇怪的问题。如果我获取一些RSS源，比如http://rss.slashdot.org/Slashdot/slashdot它运行良好。然而，我试图解析的RSS提要给我带来了问题：http://www.ryanhache.com/feed
它似乎无法找到频道标签，然后循环浏览。我继承的函数如下，并使用RSS_Retrive（$url）调用。我在这些功能中遗漏了什么，或者我正在提取的提要有问题吗？
function RSS_Tags($item, $type)
{
$y = array();
$tnl = $item->getElementsByTagName("title");
$tnl = $tnl->item(0);
$title = $tnl->firstChild->textContent;
$tnl = $item->getElementsByTagName("link");
$tnl = $tnl->item(0);
$link = $tnl->firstChild->textContent;
$tnl = $item->getElementsByTagName("pubDate");
$tnl = $tnl->item(0);
$date = $tnl->firstChild->textContent;
$tnl = $item->getElementsByTagName("description");
$tnl = $tnl->item(0);
$description = $tnl->firstChild->textContent;
$y["title"] = $title;
$y["link"] = $link;
$y["date"] = $date;
$y["description"] = $description;
$y["type"] = $type;
return $y;
}
function RSS_Channel($channel)
{
global $RSS_Content;
$items = $channel->getElementsByTagName("item");
// Processing channel
$y = RSS_Tags($channel, 0); // get description of channel, type 0
array_push($RSS_Content, $y);
// Processing articles
foreach($items as $item)
{
$y = RSS_Tags($item, 1); // get description of article, type 1
array_push($RSS_Content, $y);
}
}
function RSS_Retrieve($url)
{
global $RSS_Content;
$doc = new DOMDocument();
$doc->load($url);
$channels = $doc->getElementsByTagName("channel");
$RSS_Content = array();
foreach($channels as $channel)
{
RSS_Channel($channel);
}
}
您的代码似乎可以工作，但任务可以更简单地完成，而且不需要使用全局变量。
function RSS_Tags($node, $map, $type) {
$item = array();
foreach ($map as $elem=>$key) {
$item[$key] = (string) $node->{$elem};
}
$item['type'] = $type;
return $item;
}
function RSS_Retrieve($url) {
$rss = simplexml_load_file($url);
$elements = array('title'=>'title', 'link'=>'link',
'pubDate'=>'date', 'description'=>'description');
$feed = array();
foreach ($rss->channel as $channel) {
$feed[] = RSS_Tags($channel, $elements, 0);
foreach ($channel->item as $item) {
$feed[] = RSS_Tags($item, $elements, 1);
}
}
return $feed;
}
$url = 'http://www.ryanhache.com/feed';
$RSS_Content = RSS_Retrieve($url);