php如何修改xml内容

php修改xml内容的方法：首先打开xml文件；然后遍历一下该xml文档；接着通过“foreach ($books as $book) {...}”方式对内容进行重新赋值；最后保存修改即可。

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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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