Question

到目前为止，这是我的代码：

$htmlString = file_get_contents("http://developer.adition/rAD41126");
$domDocument = new DOMDocument();
$domDocument->loadHTML($htmlString);
$xpath = new DOMXPATH($domDocument);
$className = "phui-property-list-properties "; 
$results = $xpath->query("//dl[@class='$className']/dd[last()]" );

var_dump($results);`

输出是一个空的DOMNodeList元素。它应该给我html部分的最后一个dd元素如下所示。 classname "phui-property-list-properties "有一个有意的额外空间，因为它出现在DOM中。

具有相关元素的DOM部分是

<dl class="phui-property-list-properties ">
   <dt class="phui-property-list-key">Project/Package Auditors </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Committed </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Parents </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Branches </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Tags </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Subscribers </dt>
   <dd class="phui-property-list-value">
     <em>None</em>
  </dd>
</dl>

我想获取带有dd

属性的最后一个class="phui-property-list-value"元素

EDIT

即使查询

，我也会得到一个空对象

$className = "phui-property-list-properties ";
$results = $xpath->query("//dl[@class='$className']");

var_dump($results);

Answer 1

DOM对象对var_dump()和print_r()不可见。 Read Here

您的代码运行正常并且还显示了结果数，但var_dump()在此处无效。以下代码显示了如何检查结果。

<?php
$htmlString = <<<EOD
<dl class="phui-property-list-properties ">
   <dt class="phui-property-list-key">Project/Package Auditors </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Committed </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Parents </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Branches </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Tags </dt>
   <dd class="phui-property-list-value">
   <dt class="phui-property-list-key">Subscribers </dt>
   <dd class="phui-property-list-value">
     <em>None</em>
  </dd>
</dl>
EOD;

$domDocument = new DOMDocument();
$domDocument->loadHTML($htmlString);
$xpath = new DOMXPATH($domDocument);
$className = "phui-property-list-properties "; 
$results = $xpath->query("//dl[@class='$className']/dd[last()]" );

foreach ($results as $result) {
    $xml = $result->ownerDocument->saveXML($result);
    var_dump($xml);
}
?>

输出：

string(74) "<dd class="phui-property-list-value">&#13;
     <em>None</em>&#13;
  </dd>"

dl dd的xpath查询无法正常工作

1 个答案: