php生成xml小疑点一个，不懂，

php生成xml小问题一个，不懂，在线等!

PHP code

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<?php
$xml_str = <<<eof
<?xml version='1.0'?>
<books>
<book>
<title>Harry Potter</title>
<publisher>Warner Bros.</publisher>
<price>39.0</price>
</book>
</books>
eof;
$dom = new DOMDocument;
$dom->loadXML($xml_str);
echo $dom->saveXML();
$dom->save("0000.xml");
?>

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XML code

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-->
<?xml version="1.0"?>
<books>
<book>
<title>Harry Potter</title>
<publisher>Warner Bros.</publisher>
[color=#FF0000]<price/>[/color]
</book>
</books>

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XML code

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->
<?xml version="1.0"?>
<books>
<book>
<title>Harry Potter</title>
<publisher>Warner Bros.</publisher>
[color=#FF0000]<price></price>[/color]
</book>
</books>

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