PHP XPath selecting last matching element [duplicate]

Question

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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()] 

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.

Answer 1

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()] 

e.g.

<?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; }