如何在数组中查找某些XML项？

Question

如何从XML文档中返回标记为guid的所有项？例如：

[guid] => http://www.motorauthority.com/blog/1060293_aston-martin-v12-zagato-2011-concorso-deleganza-villa-deste

这是我的代码：

$source = 'http://feeds.feedburner.com/motorauthority2?format=xml';
$dom = new DOMDocument();
@$dom->loadHTMLFile($source);
$xml = simplexml_import_dom($dom);
$blog = $xml->xpath("//channel");
print_r($blog);

以下是print_r的输出：

Array
(
    [0] => SimpleXMLElement Object
        (
            [language] => en
            [title] => High Gear Media Network Feed
            [description] => Latest news, reviews, and more from around the High Gear Media network of sites
            [image] => SimpleXMLElement Object
                (
                    [link] => SimpleXMLElement Object
                        (
                        )

                    [url] => http://www.motorauthority.com/images/logo-footer.jpg
                    [title] => MotorAuthority
                )

            [lastbuilddate] => Fri, 20 May 2011 04:55:17 -0400
            [generator] => High Gear Media
            [link] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                        )

                    [1] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [atom10] => http://www.w3.org/2005/Atom
                                    [rel] => self
                                    [type] => application/rss+xml
                                    [href] => http://feeds.feedburner.com/MotorAuthority2
                                )

                        )

                    [2] => SimpleXMLElement Object
                        (
                            [@attributes] => Array
                                (
                                    [atom10] => http://www.w3.org/2005/Atom
                                    [rel] => hub
                                    [href] => http://pubsubhubbub.appspot.com/
                                )

                        )

                )

            [info] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [uri] => motorauthority2
                        )

                )

            [explicit] => no
            [subtitle] => Latest news, reviews, and more from around the High Gear Media network of sites
            [meta] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [xhtml] => http://www.w3.org/1999/xhtml
                            [name] => robots
                            [content] => noindex
                        )

                )

            [feedflare] => Array
                (
                    [0] => Subscribe with My Yahoo!
                    [1] => Subscribe with NewsGator
                    [2] => Subscribe with My AOL
                    [3] => Subscribe with Bloglines
                    [4] => Subscribe with Netvibes
                    [5] => Subscribe with Google
                    [6] => Subscribe with Pageflakes
                    [7] => Subscribe with Plusmo
                    [8] => Subscribe with The Free Dictionary
                    [9] => Subscribe with Bitty Browser
                    [10] => Subscribe with NewsAlloy
                    [11] => Subscribe with Live.com
                    [12] => Subscribe with Excite MIX
                    [13] => Subscribe with Attensa for Outlook
                    [14] => Subscribe with Webwag
                    [15] => Subscribe with Podcast Ready
                    [16] => Subscribe with Flurry
                    [17] => Subscribe with Wikio
                    [18] => Subscribe with Daily Rotation
                )

            [item] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [title] => Aston Martin V12 Zagato: 2011 Concorso d'Eleganza Villa d'Este
                            [description] => The weekend is finally upon us and that means the 2011 Concorso d’Eleganza Villa d’Este is kicking off, along with all that comes with it. Yesterday we saw a sneak peek at the new Ferrari Superamerica 45, built under the automaker’s Special Projects division and destined for a home in New York. Today we have another coachbuilt...]]>
                            [pubdate] => Fri, 20 May 2011 04:55:17 -0400
                            [link] => SimpleXMLElement Object
                                (
                                )

                            [guid] => http://www.motorauthority.com/blog/1060293_aston-martin-v12-zagato-2011-concorso-deleganza-villa-deste

Answer 1

您需要的XPath表达式是

/rss/channel/item/guid

请注意simplexml_load_file()可以处理URI。没有必要通过DOMDocument。

Answer 2

您已经将XML转换为PHP数组，因此它应该是递归扫描数组以寻找您正在寻找的密钥。

这样的事情应该这样做：

<?php
function array_key_search_recursive($array,$keytofind) {
    $output = array();
    foreach($array as $key=>$value) {
        if($key == $keytofind) {
            $output[] = $value;
        } elseif(is_array($value)) {
            $output = array_merge($output, array_key_search_recursive($value,$keytofind));
        }
    }
    return $output;
}

?>

（注意我还没有测试过这段代码;我现在只是将它们拼在一起，所以它可能有错误）

[编辑]发布此答案后我注意到的第一件事是你实际上还没有把它转换为数组;它仍然是一个对象（它只是print_r格式化它就像一个数组）。上面的内容仍然有效，但您需要将其作为对象使用;可能最简单的方法就是在$array循环中将$value和foreach转换为类型数组。