How to parse HTML in PHP?

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I have used domdocument and domxpath to get the solution, you can find it at:

<?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;
    }
}

Live result: http://saji89.codepad.org/2TyOAibZ

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