php如何通过dom创建xml

PHP 通过DOM方式创建一个book.xml文件

<?php

header("Content-Type:text/html;charset:utf-8");

$doc=new DOMDocument();

$bookshlf=$doc->createElement('bookshlf');

$doc->appendChild($bookshlf);

$book=$doc->createElement('book');

$title=$doc->createElement('title');

$title->nodeValue='雪山飞狐';

$author=$doc->createElement('author');

$author->nodeValue='金庸';

$book->appendChild($title);

$book->appendChild($author);

$bookshlf->appendChild($book);

$doc->formatOutput=true;

$doc->save('book.xml');

?>