DOM解析XML

<?php
 header("content-Type:taxt/html;charset=utf-8");
 $doc= new DOMDocument('1.0','utf-8');
 $book1=$doc->createElement('book');
 $doc->appendChild($book1);
 $title=$doc->createElement('title');
 $book1->appendChild($title);
 $title->nodeValue='三国';
 $author=$doc->createElement('author');
 $book1->appendChild($author);
 $author->nodeValue='罗贯中';
$doc->formatOutput=false;
$doc->save('newbook.xml');