php 操作xml基本语法

<?php

header('content-type:text/html;charset=utf-8');

// DOM 技术解析xml文件，实际就是读取显示xml文件的内容

$xml = new DOMDocument();

$xml->load('book.xml');

$books = $xml->getElementsByTagName("book");

foreach($books as $b){

echo $b->getAttribute('id');

echo $b->getElementsByTagName('name')->item(0)->nodeValue;

echo $b->getElementsByTagName('price')->item(0)->nodeValue;

echo '<hr/>';

}

//建立xml文件基本方法

$xmlinfo= <<<aaa

<?xml version="1.0" encoding="UTF-8"?>

<books>

<book id="100">

<name>PHP技术开发</name>

<price>80</price>

</book>

<book id="101">

<name>Oracle技术</name>

<price>120</price>

</book>

<book id="102">

<name>MySQL数据库技术</name>

<price>89</price>

</book>

<book id="103">

<name>Java项目实例</name>

<price>90</price>

</book>

<book id="104">

<name>Ajax技术开发</name>

<price>50</price>

</book>

</books>

aaa;

//file_put_contents('b.xml',$xmlinfo);

//利dom方式建立xml文件

/*

$x = new DOMDocument(1.0,"utf-8");

$x->formatOutput=true;

//建立根元素

$root = $x->createElement('books');

//建立元素

$b1 = $x->createElement('book');

$id1 = $x->createAttribute('id');

$id1v = $x->createTextNode('100');

$bn = $x->createElement('name','php开发');

$bp = $x->createElement('price',80);

$id1->appendChild($id1v);

$b1->appendChild($id1);

$b1->appendChild($bn);

$b1->appendChild($bp);

$root->appendChild($b1);

$x->appendChild($root);

$x->save('s.xml');

*/

//删除s.xml文件中的一个元素

$doc = new DOMDocument(1.0,'utf-8');

$doc->formatOutput = true;

$doc->load('s.xml');

//$root= $doc->getElementsByTagName("books")->item(0);

//$book = $doc->getElementsByTagName('book')->item(2);

//$root->removeChild($book);

//$book = $doc->getElementsByTagName('book')->item(0);

//$book->parentNode->removeChild($book);

//添加元素

$idv = $doc->createTextNode($doc->getElementsByTagName('book')->length+100);

$id = $doc->createAttribute('id');

$id->appendChild($idv);

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

$name = $doc->createElement('name','java项目');

$price = $doc->createElement('price',100);

$book->appendChild($id);

$book->appendChild($name);

$book->appendChild($price);

$root = $doc->getElementsByTagName("books")->item(0);

$root->appendChild($book);

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

?>