Online PHP editor | output for rYBPq

@ 2021-02-05T16:17:17Z

<?php

$html = <<<EOD
    <h1>Escape HTML or Other Programming tags</h1>
    <p>This must be rendered without any problem</p>
    <p>
    <code style="display:block;background:rgb(230,230,230);padding:2%">
        <h4>Show this title in HTML</h4>
        <p>This paragraph must be in <strong>HTML</strong> and this <a href="">Link</a> too !</p>
        <?php 
            echo "Display this PHP code!";
        ?>
        <script>
            alert("Don't pop-up please!");
        </script>
    </code>
    <a href="">Link rendered</a>
    </p> 
EOD;

$dom = new DOMDocument; 
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$preformattedCodeNode = $dom->createElement('pre');

foreach ($xpath->query("//code") as $codeNode) {
    $codeContent = '';

    foreach($codeNode->childNodes as $codeChild) {
        $codeContent .= $dom->saveHTML($codeChild);
    }

    $preformattedCodeNode->textContent = $codeContent;
    $preformattedCodeNode->setAttribute('style', $codeNode->getAttribute('style'));

    $codeNode->parentNode->replaceChild($preformattedCodeNode, $codeNode);
}

$texte = $dom->saveHTML();
echo $texte;

Output for 8.0.30, 8.1.22 - 8.1.34, 8.2.9 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><h1>Escape HTML or Other Programming tags</h1> <p>This must be rendered without any problem</p> <p> <pre style="display:block;background:rgb(230,230,230);padding:2%"> <h4>Show this title in HTML</h4> <p>This paragraph must be in <strong>HTML</strong> and this <a href="">Link</a> too !</p> <?php echo "Display this PHP code!"; ?> <script> alert("Don't pop-up please!"); </script> </pre> <a href="">Link rendered</a> </p> </body></html>
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.29, 8.1.0 - 8.1.21, 8.2.0 - 8.2.8: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><h1>Escape HTML or Other Programming tags</h1> <p>This must be rendered without any problem</p> <p> <pre style="display:block;background:rgb(230,230,230);padding:2%"> <h4>Show this title in HTML</h4> <p>This paragraph must be in <strong>HTML</strong> and this <a href="">Link</a> too !</p> <?php echo "Display this PHP code!"; ?><script> alert("Don't pop-up please!"); </script></pre> <a href="">Link rendered</a> </p></body></html>

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