<?php
$dom = new DomDocument();
$test='<p class="Heading1-P">
<span class="Heading1-H">Chapter 1</span>
</p>
<p class="Normal-P">
<span class="Normal-H">This is chapter 1</span>
</p>
<p class="Heading1-P">
<span class="Heading1-H">Chapter 2</span>
</p>
<p class="Normal-P">
<span class="Normal-H">This is chapter 2</span>
</p>
<p class="Heading1-P">
<span class="Heading1-H">Chapter 3</span>
</p>
<p class="Normal-P">
<span class="Normal-H">This is chapter 3</span>
</p>';
$dom->loadHTML($test);
$xpath = new DOMXpath($dom);
$heading=parseToArray($xpath,'Heading1-H');
$content=parseToArray($xpath,'Normal-H');
var_dump($heading);
echo "<br/>";
var_dump($content);
echo "<br/>";
function parseToArray($xpath,$class)
{
$xpathquery="//span[@class='".$class."']";
$elements = $xpath->query($xpathquery);
if (!is_null($elements)) {
$resultarray=array();
foreach ($elements as $element) {
$nodes = $element->childNodes;
foreach ($nodes as $node) {
$resultarray[] = $node->nodeValue;
}
}
return $resultarray;
}
}