如何将XML编码为包括根元素的JSON？

Question

Let's say I have a XML document

<?xml version="1.0" encoding="utf-8" ?>
<book>
<title>Book Title</title>
<isbn>123456789</isbn>
</book>

And I want to convert this XML document into a JSON string

<?php
$xml = simplexml_load_file('book.xml');
//print '{"book":';
    print json_encode($xml, true);
//print '}';
?>

But this excludes the root element, 'book.'

Why does json_encode exclude the root element?

Answer 1

I think Zend Json Library has an option to include the root.

$jsonContents = Zend_Json::fromXml($xmlStringContents, true);

The true will cause the root to be displayed in the JSON object. Not Sure if this can be done with simplexml_load_file aad print json_encode($xml, true);