php中DOMDocument简单用法示例代码(XML创建、添加、删除、修改)

2015-01-24信息快讯网

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'; 
$_htmlpatch = '1.html'; 
jb51.net$doc = new DOMDocument('1.0', 'utf-8'); 
$doc -> formatOutput = true; 
jb51.net$root = $doc -> createElement('root');//新建节点 
jb51.net$index = $doc -> createElement('index');//新建节点 
jb51.net$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 
jb51.net$id = $doc -> createAttribute('id'); 
$newsid = $doc -> createTextNode($_id); 
$id -> appendChild($newsid); 
jb51.net$title = $doc -> createAttribute('title'); 
$newstitle = $doc -> createTextNode($_title); 
$title -> appendChild($newstitle); 
jb51.net$content = $doc -> createTextNode($_content);//节点值 
jb51.net$author = $doc -> createAttribute('author'); 
$newsauthor = $doc -> createTextNode($_author); 
$author -> appendChild($newsauthor); 
jb51.net$sendtime = $doc -> createAttribute('time'); 
$newssendtime = $doc -> createTextNode($_sendtime); 
$sendtime -> appendChild($newssendtime); 
jb51.net$index -> appendChild($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); 
jb51.net$root -> appendChild($index);//设置index为root字节点 
jb51.net$doc -> appendChild($root);//设置root为跟节点 
jb51.net$doc -> save($xmlpatch);//保存文件 
jb51.netecho $xmlpatch . ' has create success'; 
jb51.net?> 
jb51.net<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>XML操作</title> 
</head> 
jb51.net<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'; 
$_htmlpatch = '2.html'; 
jb51.net$doc = new DOMDocument(); 
$doc -> formatOutput = true; 
if($doc -> load($xmlpatch)) { 
$root = $doc -> documentElement;//获得根节点(root) 
$index = $doc -> createElement('index'); 
jb51.net$url = $doc -> createAttribute('url'); 
$patch = $doc -> createTextNode($_htmlpatch); 
$url -> appendChild($patch); 
jb51.net$id = $doc -> createAttribute('id'); 
$newsid = $doc -> createTextNode($_id); 
$id -> appendChild($newsid); 
jb51.net$title = $doc -> createAttribute('title'); 
$newstitle = $doc -> createTextNode($_title); 
$title -> appendChild($newstitle); 
jb51.net$content = $doc -> createTextNode($_content); 
jb51.net$author = $doc -> createAttribute('author'); 
$newsauthor = $doc -> createTextNode($_author); 
$author -> appendChild($newsauthor); 
jb51.net$sendtime = $doc -> createAttribute('time'); 
$newssendtime = $doc -> createTextNode($_sendtime); 
$sendtime -> appendChild($newssendtime); 
jb51.net$index -> appendChild($id); 
$index -> appendChild($title); 
$index -> appendChild($content); 
$index -> appendChild($url); 
$index -> appendChild($author); 
$index -> appendChild($sendtime); 
jb51.net$root -> appendChild($index); 
jb51.net$doc -> save($xmlpatch); 
jb51.netecho $_id . ' has been added in ' . $xmlpatch; 
jb51.net} 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"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>XML操作-添加</title> 
</head> 
jb51.net<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'; 
$_content = 'has been changed'; 
jb51.net$doc = new DOMDocument(); 
$doc -> formatOutput = true; 
jb51.netif($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!'; 
} 
jb51.net?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>XML操作-修改</title> 
</head> 
jb51.net<body> 
</body> 
</html>

//del.php 删除功能

 
<?php 
$xmlpatch = 'index.xml'; 
$_id = '2'; 
jb51.net$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!'; 
} 
jb51.net?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>XML操作-删除</title> 
</head> 
jb51.net<body> 
</body> 
</html>

jb51.net
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.

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