php如何修改 xml 文件

php修改xml文件的方法：首先打开xml文件；然后遍历一下xml文档；接着对xml文件内容进行重新赋值；最后保存文件即可。

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PHP 修改和删除XML内容的原理和方法

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>