dom_namespace_reconciliation_fix.php

<?php

use Tideways\Profiler\WithSpan;

$dom = new DOMDocument();
$root = $dom->createElementNS('http://www.w3.org/2000/xhtml', 'html');
$dom->appendChild($root);

#[WithSpan]
function addParagraphs($dom, $node, $number) {
    $s = microtime(true);
    for ($i = 0; $i < $number; $i++) {
        $element = $dom->createElementNS('http://www.w3.org/2000/xhtml', 'p', 'Hello World');
        $node->appendChild($element);
    }
    echo number_format(microtime(true) - $s, 6) . "\n";
}

for ($i = 0; $i < 3; $i++) {
    addParagraphs($dom, $root, 10000);
    usleep(PHP_VERSION_ID >= 80300 ? 1000 : 10000);
}