DOM方式对xml文档的增删改查

最新推荐文章于 2022-08-13 16:45:43 发布

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最新推荐文章于 2022-08-13 16:45:43 发布

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本文链接：https://blog.youkuaiyun.com/u011933615/article/details/22733465

本文介绍如何使用PHP中的DOMDocument类创建、读取、更新并删除XML文档中的元素。具体包括创建XML文档、添加元素及属性、读取XML内容、修改元素值以及删除元素等基本操作。

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<?xml version="1.0" encoding="utf-8"?>
<bookshelf><book><title>fhfidbvivdfkj</title></book></bookshelf>
======================================

$doc = new DOMDocument("1.0","utf-8");
//创建一个根元素,游离状态
$bookshelf = $doc -> createElement("bookshelf");
$doc -> appendChild($bookshelf);

//增加一本书
$book = $doc -> createElement("book");
$bookshelf->appendChild($book);

//给书增加标题和作者
$title = $doc -> createElement("title","天龙八部");
$book->appendChild($title);

//增加作者
$author = $doc->createElement("author","金庸");
$book->appendChild($author);
$doc->formatOutput = true;

$doc->save("test.xml");

========================================

$doc -> load("test.xml");
//先查找父元素
$book = $doc->getElementsByTagName("book")->item(0);
//再查找子元素
$title = $book->getElementsByTagName("title")->item(0);
$book->removeChild($title);
//保存
$doc->save("test.xml");

=====================================

$doc->load("test.xml");
$book = $doc->getElementsByTagName("book")->item(0);
$title = $book->getElementsByTagName("title")->item(0);
$title->nodeValue = "小兵张嘎";
$doc->save("test.xml");

======================================

$doc = new DOMDocument("1.0","utf-8");
//告诉php解析哪个xml文件,会在内存中就会生成一个节点树
$doc->load("book.xml");
//通过标签名字查找
$book = $doc->getElementsByTagName("book")->item(0);
$title = $book->getElementsByTagName("title")->item(0);
var_dump($title->nodeValue);