simplexml_load_string多个属性数组

Question

我的任务是解析从我们的某个提供商返回的数据。 XML有两个属性数组，我需要从第二个中检索信息。以下是我正在使用的数据，如print_r所示。

SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [version] => 2.0
        )

    [channel] => SimpleXMLElement Object
        (
            [title] => Content Mix for Weather-in-Pictures
            [link] => http://www.abc123.com/
            [description] => abc123 Content Server
            [docs] => http://www.rssboard.org/rss-specification
            [generator] => abc123 Content Server
            [lastBuildDate] => Wed, 22 Apr 2015 19:36:51 GMT
            [ttl] => 5
            [item] => SimpleXMLElement Object
                (
                    [title] => Weather in Pictures
                    [guid] => mk1pL9MkC2f3tz71QgUwyA2
                    [pubDate] => Wed, 22 Apr 2015 19:36:51 GMT
                    [enclosure] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [length] => 204800
                                    [type] => image/jpeg
                                    [url] => http://abc123.com
                                )
                        )
                )
        )
)

我需要检索网址。我有一种感觉，这将成为其中一个＆＃34; DUH！＆＃34;有人指出我需要做什么的时刻。

current ($xml(attributes)) // returns only version.
$xml->attributes()->url; // does not return anything.