How to modify xml content in php

How to modify the xml content in php: first open the xml file; then traverse the xml document; then reassign the content through the "foreach ($books as $book) {...}" method; finally Just save the changes.

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##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>";
    }

Running results For:

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, it 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="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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