使用PHP遍历DOM文档 [英] Iterate through DOM document with PHP

问题描述

我只是试图通过遍历PHP来获取XML文件中的所有节点名称。这是我的尝试：

I was simply trying to get all node names of an XML file in PHP by iterating through it. This is my attempt:

$doc = new DOMDocument();
$doc->preserveWhiteSpace = false;
$doc->loadXML("<?xml version='1.0' encoding='ISO-8859-1'?><user><name>Michael Taylor</name><offers>0</offers><address><street>Ringstreet 8</street><zip>1100</zip><city>Norther</city></address><credit>473.43</credit></user>");
$node = $doc->firstChild;

function iterateXML($node) {
    if($node->childNodes->length == 0) {
        echo $node->nodeName;
        return;
    }
    $children = $node->childNodes;
    foreach($children as $child) {
        iterateXML($child);
    }
}
iterateXML($node);

但是，输出为

#text#text#text#text#text#text 

什么我做错了吗？

编辑：

我的最终计划是将孩子的名字添加到父节点的名称以 _分隔，因此上面示例的最终输出应为：

My final plan was to add the name of the children to the name of the parent nodes seperated by "_", so the final output for the example above should be:

name
offers
address_street
address_zip
address_city
credit

最简单的方法是什么？

推荐答案

不仅元素是节点。您输出不带子节点的名称。在XML中仅是文本节点。

Not only the elements are nodes. You output the name of the nodes without children. In your XML that are text nodes only.

您可以检查节点类型...或使用XPath：

You could check the node type ... or use XPath:

$xml = <<<'XML'
<?xml version='1.0' encoding='ISO-8859-1'?><user><name>Michael Taylor</name><offers>0</offers><address><street>Ringstreet 8</street><zip>1100</zip><city>Norther</city></address><credit>473.43</credit></user>
XML;

$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXPath($dom);

foreach ($xpath->evaluate('//*[count(*) = 0]') as $node) {
  var_dump($node->nodeName);
}

* 匹配元素节点， // * 表示文档中的任何元素节点， [count（*）= 0] 将其限制为没有子元素节点的节点。

* matches elements nodes, //* means any element node in the document, [count(*) = 0] limits it to nodes without child element nodes.

输出：

string(4) "name"
string(6) "offers"
string(6) "street"
string(3) "zip"
string(4) "city"
string(6) "credit"

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