php - SimpleXML 和 PHP : Extract part of XML document & convert as Array

Question

考虑以下 XML:

<?xml version="1.0" encoding="UTF-8"?>
<OS>
    <data>
        <OSes>
            <centos>
                <v_5>
                    <i386>
                        <id>centos5-32</id>
                        <name>CentOS 5 - 32 bit</name>
                        <version>5</version>
                        <architecture>32</architecture>
                        <os>centos</os>
                    </i386>
                    <x86_64>
                        <id>centos5-64</id>
                        <name>CentOS 5 - 64 bit</name>
                        <version>5</version>
                        <architecture>64</architecture>
                        <os>centos</os>
                    </x86_64>
                </v_5>
                <v_6>
                    <i386>
                        <id>centos6-32</id>
                        <name>CentOS 6 - 32 bit</name>
                        <version>6</version>
                        <architecture>32</architecture>
                        <os>centos</os>
                    </i386>
                    <x86_64>
                        <id>centos6-64</id>
                        <name>CentOS 6 - 64 bit</name>
                        <version>6</version>
                        <architecture>64</architecture>
                        <os>centos</os>
                    </x86_64>
                </v_6>
            </centos>
            <ubuntu>
                <v_10>
                    <i386>
                        <id>ubuntu10-32</id>
                        <name>Ubuntu 10 - 32 bit</name>
                        <version>10</version>
                        <architecture>32</architecture>
                        <os>ubuntu</os>
                    </i386>
                    <amd64>
                        <id>ubuntu10-64</id>
                        <name>Ubuntu 10 - 64 bit</name>
                        <version>10</version>
                        <architecture>64</architecture>
                        <os>ubuntu</os>
                    </amd64>
                </v_10>
            </ubuntu>
        </OSes>
    </data>
</OS>

从上面的XML文档中，我想提取以下5个元素节点

1. <id>
2. <name>
3. <version>
4. <architecture>
5. <os>

并将它们作为数组。我尝试执行以下操作:

<?php 
require_once "xml.php";

    try {
        $xml = new SimpleXMLElement($xmlstr);
        foreach($xml->xpath(' //id | //name | //version// | //architecture | //os ') as $record) {
        echo $record;
    }
    } catch(Exception $e){
        echo $e->getMessage();
    }

上面的代码可以工作，但每个记录都是一个单独的对象。我希望有人将所有 5 个元素节点合并为一个数组元素。像这样的东西:

$osList = Array( [0] => Array(
                               ["id"] => "<id>",
                               ["name"] => "<name>",
                               ["version"] => "<version>",
                               ....
)
 .....
);

语法不正确，但你明白了。知道如何做到这一点吗？

Answer 1

这可能有帮助

$obj = new SimpleXMLElement($xml);
$rtn = array();
$cnt = 0;
foreach($obj->xpath('///OSes/*/*') as $rec)
{
  foreach ($rec as $rec_obj)
  {
    if (!isset($rtn[$cnt]))
    {
      $rtn[$cnt] = array();
    }

    foreach ($rec_obj as $name=>$val)
    {
      $rtn[$cnt][(string)$name] = (string)$val;
    }
    ++$cnt;
  }
}