帮忙看下这段PHP代码有什么错误

[vayn]

<?php

$sxe = simplexml_load_string('<books><book><title>Great American
Novel</title></book></books>');

if ($sxe === FALSE) {
echo 'Error while parsing the document';
exit;
}

$dom_sxe = dom_import_simplexml($sxe);
if (!$dom_sxe) {
echo 'Error while converting XML';
exit;
}

$dom = new DOMDocument('1.0');
$dom_sxe = $dom->importNode($dom_sxe, TRUE);
$dom_sxe = $dom->appendChild($dom_sxe);

echo $dom->saveXML('test2.xml');

?>

运行后出现：
Catchable fatal error: Argument 1 passed to DOMDocument::saveXML() must be an instance of DOMNode, string given in /opt/lampp/htdocs/app/xml_prac/DOM2SimpleXML.php on line 21

PHP Version 5.3.1

[vayn]

呃，找到原因了。

echo $dom->saveXML('test2.xml');

应该是

echo $dom->save('test2.xml');

怪不得会提示 DOMDocument::saveXML() must be an instance of DOMNode

囧

[disinfeqt]

应该发到自言自语区... 嗯

[vayn]

@disinfeqt 本来等答案，结果变成自问自答，如果有 tag 选择我就把改成自言自语:D