Online PHP editor | output for gvBrv

@ 2021-12-20T14:26:37Z

<?php

$html = <<<TAG
<h1>This is my title</h1>

<p>This is a text right under my h1 title.</p>
<p>This is some more text under my h1 title</p>

<h2>This is my level 2 heading</h2>
<p>This is text right under my level 2 heading</p>

<h3>First h3</h3>
<p>First paragraph for the first h3</p>

<h3>Second h3</h3>
<p>First paragraph for the second h3</p>

<h3>Third h3</h3>
<p>First paragraph for the third h3</p>
<p>Second paragraph for the third h3</p>

<h2>This is my level 2 heading</h2>
<p>This is text right under my level 2 heading</p>
TAG;


$dom = new DomDocument();
// Load the HTML, don't worry about it being a fragment
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);

$xpath = new DOMXPath($dom);

// Grab all H3 tags. This might need to be adjusted if there's more to the depth
$results = $xpath->query("//h3");
foreach ($results as $result) {
    var_dump(sprintf('<h3>%1$s</h3>', $result->textContent));
    
    // See if the next element is a P tag
    $next = $result->nextElementSibling;
    if ($next && 'p' === $next->nodeName) {
        var_dump(sprintf('<p>%1$s</p>', $next->textContent));
    }
}

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.27, 8.4.1 - 8.4.14: string(17) "<h3>First h3</h3>" string(39) "<p>First paragraph for the first h3</p>" string(18) "<h3>Second h3</h3>" string(40) "<p>First paragraph for the second h3</p>" string(17) "<h3>Third h3</h3>" string(39) "<p>First paragraph for the third h3</p>"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(17) "<h3>First h3</h3>" string(39) "<p>First paragraph for the first h3</p>" string(18) "<h3>Second h3</h3>" string(40) "<p>First paragraph for the second h3</p>" string(17) "<h3>Third h3</h3>" string(39) "<p>First paragraph for the third h3</p>"
Output for 7.3.13 - 7.3.33, 7.4.0 - 7.4.33: string(17) "<h3>First h3</h3>" Notice: Undefined property: DOMElement::$nextElementSibling in /in/gvBrv on line 39 string(18) "<h3>Second h3</h3>" Notice: Undefined property: DOMElement::$nextElementSibling in /in/gvBrv on line 39 string(17) "<h3>Third h3</h3>" Notice: Undefined property: DOMElement::$nextElementSibling in /in/gvBrv on line 39

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