>我正在从 Web 服务获取 XML，并且很难维护显示的 XML 元素的顺序。
下面是一个片段：
<Blocks>
<Block>
<BlockElements>
<Question QuestionID="QID59" />
<PageBreak />
<Question QuestionID="QID3" />
<Question QuestionID="QID1" />
<PageBreak />
<Question QuestionID="QID2" />
<PageBreak />
<Question QuestionID="QID47" />
</BlockElements>
</Block>
<Block>
<BlockElements>
<Question QuestionID="QID6" />
<PageBreak />
<Question QuestionID="QID8" />
<Question QuestionID="QID49" />
<Question QuestionID="QID45" />
<Question QuestionID="QID50" />
<PageBreak />
<Question QuestionID="QID9" />
<Question QuestionID="QID10" />
<PageBreak />
<Question QuestionID="QID11" />
<Question QuestionID="QID12" />
<PageBreak />
<Question QuestionID="QID13" />
<PageBreak />
<Question QuestionID="QID14" />
<PageBreak />
<Question QuestionID="QID15" />
<PageBreak />
<Question QuestionID="QID16" />
<PageBreak />
<Question QuestionID="QID17" />
<PageBreak />
<Question QuestionID="QID18" />
<Question QuestionID="QID19" />
<PageBreak />
<Question QuestionID="QID20" />
<Question QuestionID="QID21" />
<PageBreak />
<Question QuestionID="QID22" />
<Question QuestionID="QID23" />
</BlockElements>
</Block>
</Blocks>Web 服务使用空元素和（没有结束标记的元素）。这些元素在BlockElements标签中的顺序至关重要 - 它定义了表单的布局。 当我使用 SimpleXmlElement 将此 XML 转换为 PHP 对象时，我得到的是：
SimpleXMLElement Object
(
[Block] => Array
(
[0] => SimpleXMLElement Object
(
[BlockElements] => SimpleXMLElement Object
(
[Question] => Array
(
[0] => SimpleXMLElement Object
(
[@attributes] => Array
(
[QuestionID] => QID59
)
)
[1] => SimpleXMLElement Object
(
[@attributes] => Array
(
[QuestionID] => QID3
)
)
[2] => SimpleXMLElement Object
(
[@attributes] => Array
(
[QuestionID] => QID1
)
)
[3] => SimpleXMLElement Object
(
[@attributes] => Array
(
[QuestionID] => QID2
)
)
[4] => SimpleXMLElement Object
(
[@attributes] => Array
(
[QuestionID] => QID47
)
)
)
[PageBreak] => Array
(
[0] => SimpleXMLElement Object
(
)
[1] => SimpleXMLElement Object
(
)
[2] => SimpleXMLElement Object
(
)
)
)
)
....
问题元素和分页符元素被分成数组，它们的顺序将丢失。 关于维护这些元素的顺序有什么建议吗？ 我不致力于使用SimpleXmlElement-我会使用任何有效的方法。 谢谢！
你必须
知道迭代该对象的结果与"print_r"或"var_dump"的结果不同
试试这个
$parentNode = simplexml_load_string($xml);
itNode($parentNode);
function itNode($parentNode){
if($parentNode->children())
foreach ( $parentNode->children() as $node )
{
echo "name ==> " , $node->getName(),'<br>';
itNode($node);
}
}