How to Extract Text from Elements with a Specific Class in PHP Using DOMDocument?

Flatten Text from Elements with Specified Class

Introduction:

Parsing HTML using PHP DOM can be a challenge, especially when dealing with specific requirements. This article explores a solution to extract text from elements with a designated class and organize it into structured arrays.

Scenario:

Consider the following HTML content:

<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>

The goal is to extract the text from elements with the "Heading1-H" class into the $heading array and text from those with the "Normal-H" class into the $content array, resulting in:

$heading = ['Chapter 1', 'Chapter 2', 'Chapter 3'];
$content = ['This is chapter 1', 'This is chapter 2', 'This is chapter 3'];

Solution Using DOMDocument and DOMXPath:

We employ DOMDocument and DOMXPath to tackle this task.

// Load HTML into DOMDocument
$dom = new DOMDocument();
$dom->loadHTML($html);

// Create DOMXPath object
$xpath = new DOMXPath($dom);

// Get elements with desired class using XPath
$xpathQuery = "//*[@class='$class']";
$elements = $xpath->query($xpathQuery);

// Extract text from elements and store in arrays
$headings = [];
$contents = [];
foreach ($elements as $element) {
    $nodes = $element->childNodes;
    foreach ($nodes as $node) {
        $headings[] = $node->nodeValue;
    }
}

var_dump($headings);

This solution effectively parses the HTML and returns the desired arrays.

Note:

Using jQuery for this task is not recommended, as PHP DOM provides a more structured and programmatic approach to HTML manipulation.

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