Question

PHP 如何向xml中追加写入

如题，怎么在原本的XML后面增加新的信息
<?xml version="1.0" encoding="utf-8"?>
<vip>
<user>
<email>test@163.com</email>
<time>2016-05-31</time>
<ip>127.0.0.1</ip>
<user>
</vip>
===========================================
想做到自动在后面一直追加，例如
<vip>
<user>
<email>test@163.com</email>
<time>2016-05-31</time>
<ip>127.0.0.1</ip>
<user>
<user>
<email>追加1</email>
<time>追加1</time>
<ip>追加1</ip>
<user>
<user>
<email>追加2</email>
<time>追加2</time>
<ip>追加2</ip>
<user>
</vip>

麻烦告之具体怎么写，小白，跪谢！

Answer 1

1.xml:  

<?xml version="1.0" encoding="utf-8"?>
<vip>
    <user>
         <email></email>
          <time>2016-05-31</time>
          <ip>127.0.0.1</ip>
     </user>
</vip>

php:

<?php 

$xmlstr = file_get_contents('1.xml');
$users = new SimpleXMLElement($xmlstr);

$user = $users->addChild('user');
$user->addChild('email', 'test');
$user->addChild('time', 'test');
$user->addChild('ip', '127.0.0.1');

$users->asXML();
file_put_contents('1.xml', $users->asXML());