Example code for modifying and deleting XML content with PHP

This article mainly introduces the method of modifying and deleting XML content in PHP. Without further ado, let’s look at the example

The schematic diagram is as follows

Example code

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>

First traverse the xml document

<?php $doc = new DOMDocument(); $doc->load(&#39;example.xml&#39;); $books = $doc -> getElementsByTagName("book"); //遍历 foreach ($books as $book) { echo $book->getAttribute(&#39;id&#39;)."-"; echo $book->getElementsByTagName("title")->item(0)->nodeValue; echo "<br>"; }

The running result is:

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

Modify:

<?php
 
 $doc = new DOMDocument();
 $doc->load(&#39;example.xml&#39;);
 
 $books = $doc -> getElementsByTagName("book");
 //遍历
 foreach ($books as $book) {
  //将id=3的title设置为33333
  if($book->getAttribute(&#39;id&#39;)==3){
   echo $book->getAttribute(&#39;id&#39;)."-";
   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(&#39;example.xml&#39;);

After modification:

<?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>

Delete operation:

<?php
 
 $doc = new DOMDocument();
 $doc->load(&#39;example.xml&#39;);
 
 $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(&#39;id&#39;)==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(&#39;example.xml&#39;);

The result after deletion is:

<?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>

Summary

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