Query XML file with PHP to return certain bookmarks

I have an XML file full of bookmarks from Google Bookmarks. (File: http://gist.github.com/324844) I want to pull the bookmark based on this path: xml_api_reply->bookmarks-bookmark->labels-开发者_Go百科>label.

So, my question is How can I use SimpleXML to grab the bookmarks that have the label Inspiration? Some bookmarks may have more than one bookmark.

EDIT: The file listed above is just a sample.

You'll have to use XPath for that.

The nodes you want:

/xml_api_reply/bookmarks/bookmark

The filter you want to apply:

[labels/label = "Inspiration"]

Gives you the following XPath query:

/xml_api_reply/bookmarks/bookmark[labels/label = "Inspiration"]

Used in a script:

$xml_api_reply = simplexml_load_file('http://gist.github.com/raw/324844/e4b1e05118b09c61c2a5b8b9a3bab92b895de07c/GoogleBookmarksXMLOutput');

foreach ($xml_api_reply->xpath('/xml_api_reply/bookmarks/bookmark[labels/label = "Inspiration"]') as $bookmark)
{
    // ...
    echo $bookmark->asXML();
}

Alternatively, you could also use the shorter //bookmark[labels/label = "Inspiration"] -- see that XPath tutorial