php中DOMDocument简单用法，XML创建、添加、删除、修改

2023-11-08 22:51•php•阅读 1893

PHP写XML方法很多，这里主要介绍一下DOMDocument的用法，跟 JS大体上相同，其实非常简单。

共分四个文件，分别是创建、增加、删除、修改四个功能，变量都是写死的，改一改用$_POST方式接收就可以用了

//index.php 创建功能

<?php

$xmlpatch = 'index.xml';

$_id = '1';

$_title = 'title1';

$_content = 'content1';

$_author = 'author1';

$_sendtime = 'time1';

$_htmlpatch = '1.html';

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

$doc -> formatOutput = true;

$root = $doc -> createElement('root');//新建节点

$index = $doc -> createElement('index');//新建节点

$url = $doc -> createAttribute('url');//新建属性

$patch = $doc -> createTextNode($_htmlpatch);//新建TEXT值

$url -> appendChild($patch);//将$patch文本设为$url属性的值

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

$newsid = $doc -> createTextNode($_id);

$id -> appendChild($newsid);

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

$newstitle = $doc -> createTextNode($_title);

$title -> appendChild($newstitle);

$content = $doc -> createTextNode($_content);//节点值

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

$newsauthor = $doc -> createTextNode($_author);

$author -> appendChild($newsauthor);

$sendtime = $doc -> createAttribute('time');

$newssendtime = $doc -> createTextNode($_sendtime);

$sendtime -> appendChild($newssendtime);

$index -> appendChild($id);//将$id设为index节点的属性，以下类同

$index -> appendChild($title);

$index -> appendChild($content);

$index -> appendChild($url);

$index -> appendChild($author);

$index -> appendChild($sendtime);

$root -> appendChild($index);//设置index为root字节点

$doc -> appendChild($root);//设置root为跟节点

$doc -> save($xmlpatch);//保存文件

echo $xmlpatch . ' has create success';

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>XML操作</title>

</head>

<body>

</body>

</html>

//add.php 增加功能(跟index.php文件差不多，主要就是加个load载入跟 $root = $doc -> documentElement获得跟节点

<?php

$xmlpatch = 'index.xml';

$_id = '2';

$_title = 'title2';

$_content = 'content2';

$_author = 'author2';

$_sendtime = 'time2';

$_htmlpatch = '2.html';

$doc = new DOMDocument();

$doc -> formatOutput = true;

if($doc -> load($xmlpatch)) {

$root = $doc -> documentElement;//获得根节点(root)

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

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

$patch = $doc -> createTextNode($_htmlpatch);

$url -> appendChild($patch);

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

$newsid = $doc -> createTextNode($_id);

$id -> appendChild($newsid);

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

$newstitle = $doc -> createTextNode($_title);

$title -> appendChild($newstitle);

$content = $doc -> createTextNode($_content);

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

$newsauthor = $doc -> createTextNode($_author);

$author -> appendChild($newsauthor);

$sendtime = $doc -> createAttribute('time');

$newssendtime = $doc -> createTextNode($_sendtime);

$sendtime -> appendChild($newssendtime);

$index -> appendChild($id);

$index -> appendChild($title);

$index -> appendChild($content);

$index -> appendChild($url);

$index -> appendChild($author);

$index -> appendChild($sendtime);

$root -> appendChild($index);

$doc -> save($xmlpatch);

echo $_id . ' has been added in ' . $xmlpatch;

} else {

echo 'xml file loaded error!';

}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>XML操作-添加</title>

</head>

<body>

</body>

</html>

//edit.php 修改功能(这里只修改title属性值跟节点值)

<?php

$xmlpatch = 'index.xml';

$_id = '2';

$_title = 'has been changed';

$_content = 'has been changed';

$doc = new DOMDocument();

$doc -> formatOutput = true;

if($doc -> load($xmlpatch)) {

$root = $doc -> documentElement;

$elm = $root -> getElementsByTagName('index');

$checkexist = 0;

foreach ($elm as $new) {

if($new -> getAttribute('id') == $_id) {

$new -> setAttribute('title', $_title);

$new -> nodeValue = $_content;//修改节点值，真是太意外了，没想到跟JS一样直接能赋值...

//$new -> removeChild($new -> nodevalue);

$checkexist = 1;

}

if($checkexist == 0) {

echo $_id . ' is not found in ' . $xmlpatch;

} else {

$doc -> save($xmlpatch);

echo $_id . ' has been changed';

}

} else {

echo 'xml file loaded error!';

}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>XML操作-修改</title>

</head>

<body>

</body>

</html>

//del.php 删除功能

<?php

$xmlpatch = 'index.xml';

$_id = '2';

$doc = new DOMDocument();

$doc -> formatOutput = true;

if($doc -> load($xmlpatch)) {

$root = $doc -> documentElement;

$elm = $root -> getElementsByTagName('index');

foreach ($elm as $new) {

if($new -> getAttribute('id') == $_id) {

if($root -> removeChild($new)) {

echo $_id . ' has been deleted';

} else {

echo $_id . ' delete failed';

}

$doc -> save($xmlpatch);

} else {

echo 'xml file loaded error!';

}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>XML操作-删除</title>

</head>

<body>

</body>

</html>

总结一下，创建跟添加主要用的就是create跟appendChild，create后边跟Element就是创建节点，跟Attribute就是创建属性，TextNode就是创建值，然后appendChild就是设置从属关系，这么一看非常简单。

删除与修改都是用先获得节点列表getElementsByTagName然后foreach遍历想要修改的节点

http://hi.baidu.com/chickenlove/blog/item/e960b34f4450253bafc3abd7.html

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php中DOMDocument简单用法，XML创建、添加、删除、修改

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