如何遍历 PHP 中的 DOM 元素？
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How do I iterate through DOM elements in PHP?
提问by Esa
I have an XML file loaded into a DOM document, I wish to iterate through all 'foo' tags, getting values from every tag below it. I know I can get values via
我有一个 XML 文件加载到 DOM 文档中，我希望遍历所有“foo”标签，从它下面的每个标签中获取值。我知道我可以通过
$element = $dom->getElementsByTagName('foo')->item(0);
foreach($element->childNodes as $node){
$data[$node->nodeName] = $node->nodeValue;
}
However, what I'm trying to do, is from an XML like,
但是，我想要做的是来自 XML 之类的，
<stuff>
<foo>
<bar></bar>
<value/>
<pub></pub>
</foo>
<foo>
<bar></bar>
<pub></pub>
</foo>
<foo>
<bar></bar>
<pub></pub>
</foo>
</stuff>
iterate over every footag, and get specific baror pub, and get values from there. Now, how do I iterate over fooso that I can still access specific child nodes by name?
迭代每个foo标签，并获取特定的bar或pub，并从那里获取值。现在，我如何遍历foo以便我仍然可以按名称访问特定的子节点？
回答by roryf
Not tested, but what about:
未测试，但关于：
$elements = $dom->getElementsByTagName('foo');
$data = array();
foreach($elements as $node){
foreach($node->childNodes as $child) {
$data[] = array($child->nodeName => $child->nodeValue);
}
}
回答by Robert Rossney
It's generally much better to use XPath to query a document than it is to write code that depends on knowledge of the document's structure. There are two reasons. First, there's a lot less code to test and debug. Second, if the document's structure changes it's a lot easier to change an XPath query than it is to change a bunch of code.
使用 XPath 查询文档通常比编写依赖于文档结构知识的代码要好得多。有两个原因。首先，要测试和调试的代码要少得多。其次，如果文档的结构发生变化，那么更改 XPath 查询要比更改一堆代码容易得多。
Of course, you have to learn XPath, but (most of) XPath isn't rocket science.
当然，您必须学习 XPath，但（大部分）XPath 不是火箭科学。
PHP's DOM uses the xpath_evalmethod to perform XPath queries. It's documented here, and the user notes include some pretty good examples.
PHP 的 DOM 使用该xpath_eval方法来执行 XPath 查询。它记录在此处，用户注释包括一些非常好的示例。
回答by Robert Rossney
Here's another (lazy) way to do it.
这是另一种（懒惰的）方法。
$data[][$node->nodeName] = $node->nodeValue;
回答by Daniele Orlando
With FluidXMLyou can query and iterate XML very easly.
使用FluidXML，您可以非常轻松地查询和迭代 XML。
$data = [];
$store_child = function($i, $fooChild) use (&$data) {
$data[] = [ $fooChild->nodeName => $fooChild->nodeValue ];
};
fluidxml($dom)->query('//foo/*')->each($store_child);
