解析RSS封装URL - PHP

Question

我需要图像附件的链接。

<item> <title>Patches of Snow on the Red Planet</title>
<link>http://www.nasa.gov/image-feature/patches-of-snow-on-the-red- 
planet</link>
<description>In early Martian summer, at the time NASA&#039;s Mars 
Reconnaissance Orbiter acquired this image, the dunes are almost free of 
their seasonal ice cover.</description>
<enclosure 
url="http://www.nasa.gov/sites/default/files/thumbnails/image/marssnow.jpg" 
length="516834" type="image/jpeg" />
<guid isPermaLink="false">http://www.nasa.gov/image-feature/patches-of-snow- 
on-the-red-planet</guid>
<pubDate>Tue, 05 Jun 2018 15:06 EDT</pubDate>
<source url="http://www.nasa.gov/rss/dyn/image_of_the_day.rss">NASA Image of 
the Day</source>
</item>

我试过各种置换方法

$this->enclosure->url;

$this->enclosure['url'];

等。

即使我尝试获取附件的长度，我仍然可以得到文章的url。

我得到的是“链接”url，而不是附件url。

感谢您的帮助。提前谢谢你。

Answer 1

之后，您应该使用getElementsByTagName('enclosure')通过标记名获取DOM元素，然后使用getAttribute('url')从enclosure标记获取url

我的代码

<?php
// XML test 
$xml = <<< XML
<item> <title>Patches of Snow on the Red Planet</title>
<link>http://www.nasa.gov/image-feature/patches-of-snow-on-the-red- 
planet</link>
<description>In early Martian summer, at the time NASA&#039;s Mars 
Reconnaissance Orbiter acquired this image, the dunes are almost free of 
their seasonal ice cover.</description>
<enclosure 
url="http://www.nasa.gov/sites/default/files/thumbnails/image/marssnow.jpg" 
length="516834" type="image/jpeg" />
<guid isPermaLink="false">http://www.nasa.gov/image-feature/patches-of-snow- 
on-the-red-planet</guid>
<pubDate>Tue, 05 Jun 2018 15:06 EDT</pubDate>
<source url="http://www.nasa.gov/rss/dyn/image_of_the_day.rss">NASA Image of 
the Day</source>
</item>
XML;

$dom = new DOMDocument;
$dom->loadXML($xml);
$ens = $dom->getElementsByTagName('enclosure');

foreach ($ens as $en)
{
    // you can debug here
    echo $en->getAttribute('url');
}