How to modify the content of xml file in php

How to modify the content of the xml file in php: first traverse the xml document; then modify the content through the statement "foreach ($books as $book) {...}"; and finally re-sava it.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How does php modify the content of the xml file?

For example:

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

Modification:

<?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>

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