废话不多说，贴代码:
<?php
$xml = <<<EOF
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book id="1">
<title>Code Generation in Action</title>
<author><first>Jack</first><last>Herrington</last></author>
<publisher>Manning</publisher>
</book>
<book id="2">
<title>PHP Hacks</title>
<author><first>Jack</first><last>Herrington</last></author>
<publisher>O'Reilly</publisher>
</book>
<book id="3">
<title>Podcasting Hacks</title>
<author><first>Jack</first><last>Herrington</last></author>
<publisher>O'Reilly</publisher>
</book>
</books>
EOF;
echo $json = json_encode(simplexml_load_string($xml));
?>整个过程就是一行，灰墙之ez.
另：可以跟以前写的“用php将rss转化为json格式”比较一下.
]]>下面是一个RSS的例子，我们准备用simplexml来解析它。
[xml]
The old Penn Station in New York was torn down before I was born.
Looking at these pictures, that feels like a mistake. The current site is
functional, but no more; really just some office towers and underground
corridors of no particular interest or beauty. The new Madison Square…
to type some random string in your subject such as E37T to get through.
Needless to say neither I nor most other people bother to communicate with
these paranoids. They are grossly overreacting to the spam problem.
Personally I won’t …
首先载入一个xml
$rss = simplexml_load_file('http://www.ooso.net/index.php/feed/');
这里使用的是simplexml_load_file函数，能够马上解析指定url的xml文件，因为是simplexml，所以simple。下面就可以象读取php数组一样来使用解析后xml的内容了，比如读取RSS的标题：
$title = $rss->channel->title;
<title><?php echo $title; ?></title>或者是循环显示rss的各个ITEM节点
$rss->channel->item //这个是itemforeach ($rss->channel->item as $item) {
echo "<h2>" . $item->title . "</h2>";
echo "<p>" . $item->description . "</p>";
}把上面的代码整合在一起，就是一个五脏俱全的麻雀牌RSS Reader了。
<?php
// 载入并解析XML
$rss = simplexml_load_file('http://partners.userland.com/nytRss/nytHomepage.xml');
$title = $rss->channel->title;
?>
<html xml:lang="en" lang="en">
<head>
<title><?php echo $title; ?></title>
</head>
<body>
<h1><?php echo $title; ?></h1>
<?php
// 循环输出ITEM节点的说明
foreach ($rss->channel->item as $item) {
echo "<h2><a href='" . $item->link . "'>" . $item->title . "</a></h2>";
echo "<p>" . $item->description . "</p>";
}
?>
</body>
</html>Simplexml,真的很simple,不信可以拿去和php的DOM function做下比较:)
http://www-128.ibm.com/developerworks/xml/library/x-simplexml.html
]]>