使用PHP解析XML [英] Parsing XML using PHP

问题描述

我一直在用PHP解析XML时遇到问题，却没有真正找到正确的方式"或至少没有一种标准化的解析XML文件的方式.

I've consistently had an issue with parsing XML with PHP and not really found "the right way" or at least a standardised way of parsing XML files.

首先，我正在尝试对此进行解析:

Firstly i'm trying to parse this:

  <item> 
     <title>2884400</title> 
     <description><![CDATA[ ><img width="126" alt="" src="http://userserve-ak.last.fm/serve/126/27319921.jpg" /> ]]></description> 
     <link>http://www.last.fm/music/+noredirect/Beatles/+images/27319921</link> 
     <author>anne710</author> 
     <pubDate>Tue, 21 Apr 2009 16:12:31 +0000</pubDate> 
     <guid>http://www.last.fm/music/+noredirect/Beatles/+images/27319921</guid> 
     <media:content url="http://userserve-ak.last.fm/serve/_/27319921/Beatles+2884400.jpg" fileSize="13065" type="image/jpeg" expression="full"  width="126" height="126" /> 
     <media:thumbnail url="http://userserve-ak.last.fm/serve/126/27319921.jpg" type="image/jpeg" width="126" height="126" /> 
  </item> 

我正在使用以下代码:

$doc = new DOMDocument();
$doc->load('http://ws.audioscrobbler.com/2.0/artist/beatles/images.rss');
$arrFeeds = array();
foreach ($doc->getElementsByTagName('item') as $node) {
    $itemRSS = array ( 
        'title' => $node->getElementsByTagName('title')->item(0)->nodeValue,
        'desc' => $node->getElementsByTagName('description')->item(0)->nodeValue,
        'link' => $node->getElementsByTagName('link')->item(0)->nodeValue,
        'date' => $node->getElementsByTagName('pubDate')->item(0)->nodeValue
        );
    array_push($arrFeeds, $itemRSS);
}

现在我想获取"media:content"和"media:thumbnail" URL属性，我该怎么做?现在我认为我应该使用DOMElement :: getAttribute，但是我没有设法使其起作用:/任何人都可以对此有所了解，也请让我知道这是否是解析XML的好方法吗?

Now I want to get the "media:content" and "media:thumbnail" url attributes, how would i do that? Now i think i should be using DOMElement::getAttribute but i haven't managed to get it to work :/ Can anyone shed some light on this, and also let me know if this is a good way to parse XML?

关于， 沙迪

推荐答案

这就是我最终使用XMLReader完成的方式:

This was how i have eventually done it using XMLReader:

<?php

define ('XMLFILE', 'http://ws.audioscrobbler.com/2.0/artist/vasco%20rossi/images.rss');
echo "<pre>";

$items = array ();
$i = 0;

$xmlReader = new XMLReader();
$xmlReader->open(XMLFILE, null, LIBXML_NOBLANKS);

$isParserActive = false;
$simpleNodeTypes = array ("title", "description", "media:title", "link", "author", "pubDate", "guid");

while ($xmlReader->read ())
{
    $nodeType = $xmlReader->nodeType;

    // Only deal with Beginning/Ending Tags
    if ($nodeType != XMLReader::ELEMENT && $nodeType != XMLReader::END_ELEMENT) { continue; }
    else if ($xmlReader->name == "item") {
        if (($nodeType == XMLReader::END_ELEMENT) && $isParserActive) { $i++; }
        $isParserActive = ($nodeType != XMLReader::END_ELEMENT);
    }

    if (!$isParserActive || $nodeType == XMLReader::END_ELEMENT) { continue; }

    $name = $xmlReader->name;

    if (in_array ($name, $simpleNodeTypes)) {
        // Skip to the text node
        $xmlReader->read ();
        $items[$i][$name] = $xmlReader->value;
    } else if ($name == "media:thumbnail") {
        $items[$i]['media:thumbnail'] = array (
                "url" => $xmlReader->getAttribute("url"),
                "width" => $xmlReader->getAttribute("width"),
                "height" => $xmlReader->getAttribute("height"),
                "type" => $xmlReader->getAttribute("type")
        );
    } else if ($name == "media:content") {
        $items[$i]['media:content'] = array (
                "url" => $xmlReader->getAttribute("url"),
                "width" => $xmlReader->getAttribute("width"),
                "height" => $xmlReader->getAttribute("height"),
                "filesize" => $xmlReader->getAttribute("fileSize"),
                "expression" => $xmlReader->getAttribute("expression")
        );
    }
}

print_r($items);
echo "</pre>";

?>

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