Question

我有XML个数据，其中某些商品标签包含 media：content 标签。如何检查XML中是否存在该内容，以及如何在 media：content 标记下进行说明？
这是XML数据：

<rss xmlns:content="" xmlns:wfw="" xmlns:dc="" xmlns:atom="" xmlns:sy="" xmlns:slash="" version="2.0">
    <channel>
        <item>
            <title>Title1</title>
            <link>Link</link>
            <pubDate>Date</pubDate>
            <content:encoded>
                <![CDATA[ This is description 1 ]]>
                <![CDATA[ This is description 2 ]]>
            </content:encoded>
            <media:content url="URL" type="image/jpeg">
                <media:description>
                    <![CDATA[ Text ]]>
                </media:description>
            </media:content>
        </item>

        <item> -- this item tag does not have media: content
            <title>Title2</title>
            <link>Link2</link>
            <pubDate>Date2</pubDate>
            <content:encoded>
                <![CDATA[ This is description 3 ]]>
                <![CDATA[ This is description 4 ]]>
            </content:encoded>
        </item>

        <item>
            <title>Title3</title>
            <link>Link3</link>
            <pubDate>Date3</pubDate>
            <content:encoded>
                <![CDATA[ This is description 5 ]]>
                <![CDATA[ This is description 6 ]]>
            </content:encoded>
            <media:content url="UR1L" type="image/jpeg">
                <media:description>
                    <![CDATA[ Text 2 ]]>
                </media:description>
            </media:content>
        </item>
    </channel>
</rss>

我尝试的是：

<?php
function feeds() 
{
    $url = "http://localhost/xmldata/xmld.xml"; // xmld.xml contains above data
    $feeds = file_get_contents($url);
    $rss = simplexml_load_string($feeds);
    foreach($rss->channel->item as $entry) {
         if($entry->children('media', true)->content->attributes()) {
                $md = $entry->children('media', true)->content->attributes();
                print_r("$md->url");
            }
    }
}
?>

它返回我的错误如下：

节点不再存在

即使我不知道媒体：内容标记中的媒体：描述。

Answer 1

您可以使用isset来检查“媒体：内容”是否正确。属性设置在SimpleXMLElement。

我认为如果你改变这些行会有所帮助：

foreach($rss->channel->item as $entry) {
    if($entry->children('media', true)->content->attributes()) {
        $md = $entry->children('media', true)->content->attributes();
        print_r("$md->url");
    }
}

到这些方面：

$rss = @simplexml_load_string($feeds);
foreach ($rss->channel->item as $entry) {
    if (isset($entry->{'media:content'})) {
        $url = (string)$entry->{'media:content'}->attributes()->url;
        $description = (string)$entry->{'media:content'}->{'media:description'};
        echo "$url<br>";
        echo "$description<br>";
    }
}

将导致：

URL

文本

UR1L

文字2

Answer 2

这对我有用。

$namespaces = $entry->getNamespaces(true);   

$media_url =    trim((string)$entry->children($namespaces['media'])->content->attributes()->url);

获取媒体：描述和媒体：来自xml

2 个答案: