Question

我需要对RSS Feed进行过滤和重新排序。

使用PHP，如何检测附件中是否有链接url=""？

其中大多数都是空的，但我想将此标签中包含链接的整个项目移到顶部。

以下是我将要使用的代码示例。我猜我会用isset？类似的东西：

if (isset($enclosure)){
    HOW WOULD I SELECT THE PARENT ITEM? AND EVERYTHING IN IT? AND THEN MOVE IT TO THE TOP?
}

<item>
    <title><![CDATA[Article title 1]]></title>
    <link><![CDATA[http://www.articlelinkone.com]]></link>
    <pubDate><![CDATA[Tue, 26 Feb 2013 15:45:00 EDT]]></pubDate>
    <description><![CDATA[Article discription 1<br />Some HTML will exist]]></description>
    <enclosure url="" type="image/jpeg"></enclosure>
    <thumbnail url="" type="image/jpeg"></thumbnail>
    <summary><![CDATA[Summary for article]]></summary>
    <guid><![CDATA[Guide for article]]></guid>
    <source url="http://www.article.com/"/>
</item> 
<item>
    <title><![CDATA[Article title 1]]></title>
    <link><![CDATA[http://www.articlelinkone.com]]></link>
    <pubDate><![CDATA[Tue, 26 Feb 2013 15:45:00 EDT]]></pubDate>
    <description><![CDATA[Article discription 1<br />Some HTML will exist]]></description>
    <enclosure url="" type="image/jpeg"></enclosure>
    <thumbnail url="" type="image/jpeg"></thumbnail>
    <summary><![CDATA[Summary for article]]></summary>
    <guid><![CDATA[Guide for article]]></guid>
    <source url="http://www.article.com/"/>
</item> 
<item>
    <title><![CDATA[Article title 1]]></title>
    <link><![CDATA[http://www.articlelinkone.com]]></link>
    <pubDate><![CDATA[Tue, 26 Feb 2013 15:45:00 EDT]]></pubDate>
    <description><![CDATA[Article discription 1<br />Some HTML will exist]]></description>
    <enclosure url="http://articleone.com/image1.jpg" type="image/jpeg"></enclosure>
    <thumbnail url="http://articleone.com/thumb/image1.jpg" type="image/jpeg"></thumbnail>
    <summary><![CDATA[Summary for article]]></summary>
    <guid><![CDATA[Guide for article]]></guid>
    <source url="http://www.article.com/"/>
</item> 
<item>
    <title><![CDATA[Article title 1]]></title>
    <link><![CDATA[http://www.articlelinkone.com]]></link>
    <pubDate><![CDATA[Tue, 26 Feb 2013 15:45:00 EDT]]></pubDate>
    <description><![CDATA[Article discription 1<br />Some HTML will exist]]></description>
    <enclosure url="" type="image/jpeg"></enclosure>
    <thumbnail url="" type="image/jpeg"></thumbnail>
    <summary><![CDATA[Summary for article]]></summary>
    <guid><![CDATA[Guide for article]]></guid>
    <source url="http://www.article.com/"/>
</item>

Answer 1

以下是使用SimpleXML检查机箱网址是否为空的方法：

<?php
$xml = new new SimpleXMLElement($xml_content)
foreach( $xml->item AS $item ) {
    if( !empty( $item->enclosure['url'] ))
        // Do whatever you want
}

根据您的目的，您可以将$item放入新数组，构建新的XML文件等。

Answer 2

你有没有看过SimpleXML？您将能够轻松地反转xml对象中的项目，如：

$str = file_get_contents($url);
$xml = simplexml_load_string($str);
$items = array_reverse($xml->xpath('item'));

Answer 3

我认为你真的应该看看php dom xml

DOM XML的简单示例：

<?php
$xmlDoc = new DOMDocument();
$xmlDoc->load("note.xml");

$x = $xmlDoc->documentElement;
foreach ($x->childNodes AS $item)
  {
  print $item->nodeName . " = " . $item->nodeValue . "<br>";
  }
?>

You may read the full tutorial on W3Schools (recommended)

使用PHP重新排序RSS提要

3 个答案: