谁能告诉我怎么用PHP向XML中添加新元素啊?

class Articles extends DomDocument {

function __construct() {

//必须调用!

parent::__construct()

}

function addArticle($title) {

$item = $this->createElement("item")

$titlespace = $this->createElement("title")

$titletext = $this->createTextNode($title)

$titlespace->appendChild($titletext)

$item->appendChild($titlespace)

$this->documentElement->appendChild($item)

}

}

$dom = new Articles()

$dom->load("articles.xml")

$dom->addArticle("XML in PHP5")

print $dom->save("newfile.xml")

HTML

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我是用DOMDocument对象来 *** 作xml的  代码如下

<?php

//加载xml

$path = $_SERVER["DOCUMENT_ROOT"].'/20150524/book.xml'

//实例化类

$books = new DOMDocument()

//通过方法加载

$books->load($path)

//添加元素/属性

$newItem=$books->createElement('item')  //创建新元素

        $title=$books->createElement('title')  //创建子元素

        $title->nodeValue='newtitle'

        $newItem->appendChild($title)  //把子元素添加到父元素上

$content=$books->createElement('content')  //创建子元素

        $content->nodeValue='newcontent'

        $newItem->appendChild($content)  //把子元素添加到父元素上

        //添加到第一个节点前

$books->documentElement->insertbefore($newItem,$elements->item(0))

        $books->save($path)  //保存

?>

添加后  xml文件如下所示

<?xml version="1.0"?>

<books>

    <item>

        <title>newTitle</title>

        <content>newContent</content>

    </item>

    <book name="JavaScript: The Defiitive Guide" publisher="O'Reilly Media, Inc.">

        <author>David Flanagan</author>

    </book>

    <book name="PHP anf MySQL Web Development" publisher="Perason Education">

        <author>Luke Welling</author>

        <author>Laura Thomson</author>

    </book>

    <book name="HTTP: The Defiitive Guide" publisher="O'Reilly Media, Inc.">

        <author>David Courley</author>

        <author>Brian Totty</author>

    </book>

</books>

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