try to grab data between class tag with PHP DOMXPATH

Question

I am trying to grab the data between two css class tag in my html doc.

Here the example.

<p class="heading10">text text</p>
<p>text text text</p>
<p>text text text</p>
<p class="heading11">text text</p>
<p></p>
<p></p>

I don't know how to grab the

data between that

class heading10 and heading11.

I tried //p[@class="heading10"]//following-sibling::p], it will grab all <p> after the class heading10.

Answer 1

Try something like

//p[@class="heading10"]/following-sibling::p[position()<count(//p[@class="heading11"]/preceding-sibling::p)]

EDIT:

A bit more explanations for @jpaugh:

The OP's xpath grabs all sibling p elements after the one with class="heading10". I have added the restriction for position() of the these elements to be less than position of the p element with class="heading11".

Following code is confirmed to be working with php 5.5, and does not work with php 5.4(thanks @slphp):

$t = '<?xml version="1.0"?>
<root><p class="heading10">text text</p>
<p>text text text</p>
<p>text text text</p>
<p class="heading11">text text</p>
<p></p>
<p></p></root>';

$d = DOMDocument::LoadXML($t);
$x = new DOMXpath($d);
var_dump($x->query('//p[@class="heading10"]/following-sibling::p[position()<count(//p[@class="heading11"]/preceding-sibling::p)]'));


class DOMNodeList#6 (1) {
  public $length =>
  int(2)
}

Please note, that if <p class="heading10"> is not the first p element, than you probably need to subtract them:

//p[@class="heading10"]/following-sibling::p[position()<(count(//p[@class="heading11"]/preceding-sibling::p) - count(//p[@class="heading10"]/preceding-sibling::p))]

Splitting by lines for the sake of readability:

//p[@class="heading10"]
 /following-sibling::p[
     position()<(
         count(//p[@class="heading11"]/preceding-sibling::p) -
         count(//p[@class="heading10"]/preceding-sibling::p)
     )
  ]