php - 使用 PHP 搜索 XML

Question

我是 PHP 的初学者。我有一个 XML 文件。我想搜索具有name属性值的节点，并将其子节点的文本值存储到变量中。我怎样才能用 PHP 代码做到这一点。

例子。

<Server>
      <Server1>
             <ipaddress name="10.3.0.5">
                         <username>user</username>
                         <password>password</password>
             </ipaddress>
      </Server1>
</Server>

这是我拥有的 XML 文件。此 XML 文件中的父节点<Server>将包含许多<Server1>子节点。在这里，我想在使用关键字（即属性）搜索时将节点<username>（用户）和（密码）内的数据放入两个不同的变量中节点的值）。请为此提供一个不错的 PHP 代码。<password>10.3.0.5idipaddress

Answer 1

让我首先按照我的理解重述您的问题：如果您有几个服务器元素的子元素，每个子元素都有一个由 IP 地址标识的子元素，那么您如何提取给定 IP 地址的用户名和密码？

如果这确实是您的问题，我相信下面的解决方案可以为您工作：

<?php

// Declare which ip address you want to get more information about
$ip_address_to_find = '10.3.0.5';

// Full xml string that you need to search through (this is an imagined example. The last element in this xml is the one we're going to find)
$xml_string = '
<Server>
      <Server1>
             <ipaddress name="10.3.0.1">
                         <username>username1</username>
                         <password>password1</password>
             </ipaddress>
      </Server1>
      <Server2>
             <ipaddress name="10.3.0.2">
                         <username>username2</username>
                         <password>password2</password>
             </ipaddress>
      </Server2>
      <Server3>
             <ipaddress name="10.3.0.3">
                         <username>username3</username>
                         <password>password3</password>
             </ipaddress>
      </Server3>
      <Server4>
             <ipaddress name="10.3.0.4">
                         <username>username4</username>
                         <password>password4</password>
             </ipaddress>
      </Server4>
      <Server5>
             <ipaddress name="10.3.0.5">
                         <username>username5</username>
                         <password>password5</password>
             </ipaddress>
      </Server5>
</Server>';

// Use simplexml to make an object out of it
$xml_object = simplexml_load_string($xml_string);

// Cycle through the object until you find a match
foreach($xml_object as $server){
    if($server->ipaddress->attributes()->name == $ip_address_to_find ){
        $username = $server->ipaddress->username;
        $password = $server->ipaddress->password;
        // Now use $username and $password however you want
        // for example:
        echo 'For the server with IP address: '.$ip_address_to_find.', the username is: '.$username.', and the password is: '.$password.'.'.PHP_EOL;
    }
}
?>