php怎么修改xml文件内容

php修改xml文件内容的方法：首先遍历一下xml文档；然后通过语句“foreach ($books as $book) {...}”修改内容；最后重新sava一下即可。

本文操作环境：Windows7系统、PHP7.1版，DELL G3电脑

php怎么修改xml文件内容?

例如：

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>

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