How can I extract text from specific HTML elements with different classes into separate arrays using PHP?-PHP Tutorial-php.cn

How can I extract text from specific HTML elements with different classes into separate arrays using PHP?

Patricia Arquette

Release： 2024-11-21 12:01:10

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How can I extract text from specific HTML elements with different classes into separate arrays using PHP?

Extract Text from Specific HTML Elements into Arrays

Problem:

You possess HTML content with elements containing both headings and regular text. Your goal is to extract the text from elements with a designated class ("Heading1-H" for headings, "Normal-H" for text) into two separate arrays: $heading and $content.

Solution:

Using PHP DOM and XPath

PHP DOM (Document Object Model) and XPath (XML Path Language) offer a robust solution for this task. Here's the implementation:

$test = <<<HTML
<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>
HTML;

$dom = new DOMDocument();
$dom->loadHTML($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(DOMXPath $xpath, string $class): array
{
    $xpathquery = "//*[@class='$class']";
    $elements = $xpath->query($xpathquery);

    $resultarray = [];
    foreach ($elements as $element) {
        $nodes = $element->childNodes;
        foreach ($nodes as $node) {
            $resultarray[] = $node->nodeValue;
        }
    }

    return $resultarray;
}

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Output:

array(3) {
  [0] => string(8) "Chapter 1"
  [1] => string(8) "Chapter 2"
  [2] => string(8) "Chapter 3"
}
<br/>
array(3) {
  [0] => string(15) "This is chapter 1"
  [1] => string(15) "This is chapter 2"
  [2] => string(15) "This is chapter 3"
}
<br/>

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