PHP XPath选择最后一个匹配元素 [英] PHP XPath selecting last matching element

问题描述

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我需要使用"myClass"类查找最后一个span元素的内容.我尝试了各种组合，但找不到答案.

I need to find the contents of the last span element with a class of 'myClass'. I've tried various combinations but can't find the answer.

//span[@class='myPrice' and position()=last()]

这将返回所有带有"myClass"类的元素，我猜这是因为每个找到的元素在处理时都是最后一个元素-但我只需要实际的最后一个匹配元素即可.

This returns all the elements with class 'myClass', I'm guessing this is because each found element is the last at the time of processing - but I just need the actual last matching element.

推荐答案

您必须为要标记//span[@class='myPrice']的处理器标记为当前集合，然后将谓词position()= last()应用于该处理器.设置.

You have to mark for the processor that you want to treat //span[@class='myPrice'] as the current set and then apply the predicate position()=last() to that set.

(//span[@class='myPrice'])[last()]

例如

<?php
$doc = getDoc();
$xpath = new DOMXPath($doc);
foreach( $xpath->query("(//span[@class='myPrice'])[last()]") as $n ) {
  echo $n->nodeValue, "\n";
}


function getDoc() {
  $doc = new DOMDOcument;
  $doc->loadxml( <<< eox
<foo>
  <span class="myPrice">1</span>
  <span class="yourPrice">0</span>
  <bar>
    <span class="myPrice">4</span>
    <span class="yourPrice">99</span>
  </bar>
  <bar>
    <span class="myPrice">9</span>
  </bar>
</foo>
eox
  );
  return $doc;
}

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