用PHP5的SimpleXML解析XML文档

1、访问具有相同元素名称的节点

2、通过foreach循环所有相同元素名称的子节点

foreach($xml->channel->item as $key=>$value)
{
print "Title: " . $item->title . "/n";
}

3、输出整个文档

echo $xml->asXML();

4、把节点作为字符串输出

echo $xml->channel->item[0]->asXML();

这将输出文本

<item>
<title>Braised Sea Cucumber</title>
<link>http://menu.example.com/dishes.php?dish=cuke</link>
<description>Gentle flavors of the sea that nourish and refresh you. </description>
</item>

带文件名参数的asXML将会把原本输出的内容保存为一个文件

$xml->channel->item[0]->asXML("item[0].xml");

完整的代码：

rss.xml

=====
<?xml version="1.0" encoding="utf-8"?>
<rss version="0.91">
<channel>
　 <title>What''s For Dinner</title>
　 <link>http://menu.example.com/</link>
　 <description>These are your choices of what to eat tonight.</description>
　 <item>
　 <title>Braised Sea Cucumber</title>
　 <link>http://menu.example.com/dishes.php?dish=cuke</link>
　 <description>Gentle flavors of the sea that nourish and refresh you. </description>
　 </item>
　 <item>
　 <title>Baked Giblets with Salt</title>
　 <link>http://menu.example.com/dishes.php?dish=giblets</link>
　 <description>Rich giblet flavor infused with salt and spice. </description>
　 </item>
　 <item>
　 <title>Abalone with Marrow and Duck Feet</title>
　 <link>http://menu.example.com/dishes.php?dish=abalone</link>
　 <description>There''s no mistaking the special pleasure of abalone. </description>
　 </item>
</channel>
</rss>

rss.php

======
<?php
$xml = simplexml_load_file("rss.xml");
　　 echo "<h3>".$xml->channel->title."</h3><br>";
echo "<ul>";
echo "<li>Title:".$xml->channel->item[0]->title."</li>";
echo "<li>Title:".$xml->channel->item[1]->title."</li>";
echo "<li>Title:".$xml->channel->item[2]->title."</li>";
echo "</ul>";
print "Title: " . $xml->channel->item[0]->title . "/n<br>";
print "Title: " . $xml->channel->item[1]->title . "/n<br>";
print "Title: " . $xml->channel->item[2]->title . "/n<br>";
echo "<hr>";
　　 foreach ($xml->channel->item[0] as $element_name => $content) {
　　 print "The $element_name is $content/n<

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