PHP对XML内容进行修改和删除实例代码

本文主要介绍的是PHP对XML内容进行修改和删除的方法，下面话不多说，我们来看实例

原理图如下

示例代码

example.xml

<?xml version="1.0" encoding="utf-8"?><root> <book id="1">  <title>title1</title> </book> <book id="2">  <title>title2</title> </book> <book id="3">  <title>title3</title> </book> <book id="4">  <title>title4</title> </book> <book id="5">  <title>title5</title> </book></root>

首先遍历一下该xml文档

<?php $doc = new DOMDocument(); $doc->load('example.xml'); $books = $doc -> getElementsByTagName("book"); //遍历 foreach ($books as $book) { echo $book->getAttribute('id')."-"; echo $book->getElementsByTagName("title")->item(0)->nodeValue; echo "<br>"; }

运行结果为：

1-title1 2-title2 3-title3 4-title4 5-title5

修改：

<?php $doc = new DOMDocument(); $doc->load('example.xml'); $books = $doc -> getElementsByTagName("book"); //遍历 foreach ($books as $book) {  //将id=3的title设置为33333  if($book->getAttribute('id')==3){   echo $book->getAttribute('id')."-";   echo $book->getElementsByTagName("title")->item(0)->nodeValue="33333";   echo "<br>";  } } //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件 $doc -> save('example.xml');

修改之后为：

<?xml version="1.0" encoding="utf-8"?><root> <book id="1">  <title>title1</title> </book> <book id="2">  <title>title2</title> </book> <book id="3">  <title>33333</title> </book> <book id="4">  <title>title4</title> </book> <book id="5">  <title>title5</title> </book></root>

删除操作：

<?php $doc = new DOMDocument(); $doc->load('example.xml'); $root = $doc -> documentElement;//根标签  $books = $doc -> getElementsByTagName("book"); //遍历 foreach ($books as $book) {  //将id=4的删除  if($book->getAttribute('id')==4){   $root->removeChild($book);  } } //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件 $doc -> save('example.xml');

删除后的结果为：

<?xml version="1.0" encoding="utf-8"?><root> <book id="1">  <title>title1</title> </book> <book id="2">  <title>title2</title> </book> <book id="3">  <title>33333</title> </book> <book id="5">  <title>title5</title> </book></root>