php对xml文件中节点的删除\编辑

2009-09-24 文章来源：互联网浏览次数：2978 分享文章

php对xml文件中节点的删除\编辑

使用getElementsByTagName()方法删除\编辑XML节点

三个文件：
1.root.xml
2.remove.php —— 删除节点
3.replace.php —— 替换节点

root.xml
<root>  
<child1>child1 content</child1>  
<child2>child2 content</child2>  
<child3>child3 content</child3>  
</root>

<root> 
<child1>child1 content</child1> 
<child2>child2 content</child2> 
<child3>child3 content</child3> 
</root>

remove.php
<?php 
$xml_str = file_get_contents("root.xml"); //将root.xml文件中的内容读入一个字符串 
$doc = DOMDocument::loadXML($xml_str);  //载入这个字符串 
 
//取得元素$child2 
$root = $doc->documentElement; 
$child2 = $root->getElementsByTagName("child2")->item(0); 
 
//删除$child2对象 
$root->removeChild($child2); 
 
//保存文件 
$doc->formatOutput = true; 
$doc->saveXML(); 
$doc->save("root.xml"); 
?> 

<?php
$xml_str = file_get_contents("root.xml"); //将root.xml文件中的内容读入一个字符串
$doc = DOMDocument::loadXML($xml_str);  //载入这个字符串

//取得元素$child2
$root = $doc->documentElement;
$child2 = $root->getElementsByTagName("child2")->item(0);

//删除$child2对象
$root->removeChild($child2);

//保存文件
$doc->formatOutput = true;
$doc->saveXML();
$doc->save("root.xml");
?>

replace.php
<?php 
$xml_str = file_get_contents("root.xml"); //将root.xml文件中的内容读入一个字符串 
$doc = DOMDocument::loadXML($xml_str);  //载入这个字符串 
 
//取得元素$child3 
$root = $doc->documentElement; 
$child3 = $root->getElementsByTagName("child3")->item(0);  
 
//创建一个newchild元素来替代child3 
$root->replaceChild(new DOMElement("newchild", "new content"), $child3);  
 
//保存文件 
$doc->formatOutput = true; 
$doc->saveXML(); 
$doc->save("root.xml"); 
?>

<?php
$xml_str = file_get_contents("root.xml"); //将root.xml文件中的内容读入一个字符串
$doc = DOMDocument::loadXML($xml_str);  //载入这个字符串

//取得元素$child3
$root = $doc->documentElement;
$child3 = $root->getElementsByTagName("child3")->item(0); 

//创建一个newchild元素来替代child3
$root->replaceChild(new DOMElement("newchild", "new content"), $child3); 

//保存文件
$doc->formatOutput = true;
$doc->saveXML();
$doc->save("root.xml");
?>

使用使用XPath删除\修改节点

1.xml.xml
2.re.php —— 替换\删除节点
3.replace.xml —— 替换节点后的XML文件
4.remove.xml —— 删除节点后的XML文件

xml.xml

 
<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>PHP Hacks</title>
  <publisher>O'Reilly</publisher>
</book>
 
<book>
  <author>Jack Herrington</author>
  <title>Podcasting Hacks</title>
  <publisher>O'Reilly</publisher>
</book>
</books>

<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>PHP Hacks</title>
  <publisher>O'Reilly</publisher>
</book>

<book>
  <author>Jack Herrington</author>
  <title>Podcasting Hacks</title>
  <publisher>O'Reilly</publisher>
</book>
</books>

re.php

 
<?php 
$dom = new DomDocument(); 
$dom ->load("xml.xml"); 
$xpath = new domxpath($dom); 
 
//修改节点 
$oldtitle = $xpath->query("/books/book/title")->item(0); 
$newtitle = $dom->createElement("title"); 
$newtitle->appendChild(new DOMText("NEW")); 
$oldtitle->parentNode->replaceChild($newtitle, $oldtitle); 
$dom->save("replace.xml"); 
 
//删除节点 
$oldtitle = $xpath->query("/books/book/title")->item(1); 
$oldtitle->parentNode->removeChild($oldtitle); 
$dom->save("remove.xml"); 
?>

<?php
$dom = new DomDocument();
$dom ->load("xml.xml");
$xpath = new domxpath($dom);

//修改节点
$oldtitle = $xpath->query("/books/book/title")->item(0);
$newtitle = $dom->createElement("title");
$newtitle->appendChild(new DOMText("NEW"));
$oldtitle->parentNode->replaceChild($newtitle, $oldtitle);
$dom->save("replace.xml");

//删除节点
$oldtitle = $xpath->query("/books/book/title")->item(1);
$oldtitle->parentNode->removeChild($oldtitle);
$dom->save("remove.xml");
?>

replace.xml

 
<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>NEW</title>
  <publisher>O'Reilly</publisher>
</book>
 
<book>
  <author>Jack Herrington</author>
  <title>Podcasting Hacks</title>
  <publisher>O'Reilly</publisher>
</book>
</books>

<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>NEW</title>
  <publisher>O'Reilly</publisher>
</book>

<book>
  <author>Jack Herrington</author>
  <title>Podcasting Hacks</title>
  <publisher>O'Reilly</publisher>
</book>
</books>

remove.php

 
<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>NEW</title>
  <publisher>O'Reilly</publisher>
</book>
 
<book>
  <author>Jack Herrington</author>
  <publisher>O'Reilly</publisher>
</book>
</books>

<?xml version="1.0"?>
<books>
<book>
  <author>Jack Herrington</author>
  <title>NEW</title>
  <publisher>O'Reilly</publisher>
</book>

<book>
  <author>Jack Herrington</author>
  <publisher>O'Reilly</publisher>
</book>
</books>

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