PHP如何删除xml某条数据

PHP实现删除和修改xml数据的方法

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>

遍历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');

修改后：

<?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：

<?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：

<?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>

以上内容仅供参考！

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