Online PHP editor | output for 27IaK

@ 2020-05-25T12:17:22Z

<?php
$html = <<<HTML
<div>
<p>Paragraph one is okay </p>
<h2>This will work without problem</h2>
<p>Paragraph two is okay </p>
<h2><a href="#">This heading has anchor</a></h2>
<p>Paragraph one is okay </p>
<h2>  This heading start with space</h2>
<p>Paragraph two is okay </p>
<h3>1. <a href="https://www.example1.com/">This wont work</a></h3>
<p>Paragraph one is okay </p>
<h3>2. <a href="https://www.example2.com/">Not working</a></h3>
<p>Paragraph two is okay </p>
<h3>3. Neither this one</h3>
<h3>But this works again</h3>
</div>
HTML;

$dom = new DOMDocument; 
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach ($xpath->query("//h2 | //h3") as $node) {
    if (preg_match('~^\s*(?:\d+\.)?\s*\K\S+(?:\s+\S+){1,2}~', $node->nodeValue, $m)) {
        $node->setAttribute('id', str_replace(' ', '-', strtolower($m[0])));
    }
}
echo $dom->saveHTML();

Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: <div> <p>Paragraph one is okay </p> <h2 id="this-will-work">This will work without problem</h2> <p>Paragraph two is okay </p> <h2 id="this-heading-has"><a href="#">This heading has anchor</a></h2> <p>Paragraph one is okay </p> <h2 id="this-heading-start"> This heading start with space</h2> <p>Paragraph two is okay </p> <h3 id="this-wont-work">1. <a href="https://www.example1.com/">This wont work</a></h3> <p>Paragraph one is okay </p> <h3 id="not-working">2. <a href="https://www.example2.com/">Not working</a></h3> <p>Paragraph two is okay </p> <h3 id="neither-this-one">3. Neither this one</h3> <h3 id="but-this-works">But this works again</h3> </div>
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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