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循环simplexmlement对象只需两步

simplexml php

Chrisvdberge · 技术社区 · 14 年前

我有一个simplexmlement,我使用curl在XML文件中读取了它。尝试从中获取值时,我似乎需要使用嵌套foreach,但在类似的情况下,我可以一次性完成此操作。现在我真的很好奇为什么这不起作用:

它是美味的RSS饲料;

SimpleXMLElement Object
(
    [title] => Delicious/chrisvdberge
    [link] => http://www.delicious.com/chrisvdberge
    [description] => bookmarks posted by chrisvdberge
    [item] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [title] => Diagrammr
                    [pubDate] => Thu, 06 May 2010 12:40:07 +0000
                    [guid] => http://www.delicious.com/url/2fc2ed0e870ec9d001b645dfaed0e771#chrisvdberge
                    [link] => http://www.diagrammr.com/
                    [comments] => http://www.delicious.com/url/2fc2ed0e870ec9d001b645dfaed0e771
                    [source] => chrisvdberge's bookmarks
                    [category] => Array
                        (
                            [0] => tagthis
                            [1] => visualization
                            [2] => diagrams
                        )

                )

            [1] => SimpleXMLElement Object
                (
                    [title] => Ignite Toronto 2: Ryan Coleman - Designing for visual efficiency on Vimeo
                    [pubDate] => Mon, 18 Jan 2010 08:05:06 +0000
                    [guid] => http://www.delicious.com/url/9a0de307f3f37baaa25ad20b4dbc4537#chrisvdberge
                    [link] => http://vimeo.com/8317770
                    [comments] => http://www.delicious.com/url/9a0de307f3f37baaa25ad20b4dbc4537
                    [source] => chrisvdberge's bookmarks
                    [category] => Array
                        (
                            [0] => tagthis
                            [1] => vizthink
                        )

                )

等。

我可以使用嵌套foreach访问所有链接:

foreach ($delicious_res as $item) {
    foreach ($item->item as $entry){
        echo $entry->link."<br />";
    }
}

foreach ($delicious_res->item as $item) {
        echo $entry->link."<br />";
}

为了更好地理解SimpleXML,我真的很想知道为什么;)

1 回复 | 直到 14 年前

BMBM 14 年前

你必须使用:

foreach($delicious_res->channel->item as $item) {
    print_r($item);
}

<rss> 和 <channel> 标签 < 标记可以省略,因为它是文档的根节点)。

curl 获取rss提要xml内容。只是使用 simplexml_load_file

$delicious_res = simplexml_load_file('http://path-to-your/file.xml"');