class.ilAccessibilityDocumentsContainsHtmlValidator.php

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<?php

class ilAccessibilityDocumentsContainsHtmlValidator
{
    private string $text;

    public function __construct(string $text)
    {
        $this->text = $text;
    }

    public function isValid(): bool
    {
        if (!preg_match('/<[^>]+?>/', $this->text)) {
            return false;
        }

        try {
            $dom = new DOMDocument();
            if (!$dom->loadHTML($this->text)) {
                return false;
            }

            $iter = new RecursiveIteratorIterator(
                new ilHtmlDomNodeIterator($dom),
                RecursiveIteratorIterator::SELF_FIRST
            );
            foreach ($iter as $element) {
                if (in_array(strtolower($element->nodeName), ['body'])) {
                    continue;
                }

                if ($element->nodeType === XML_ELEMENT_NODE) {
                    return true;
                }
            }

            return false;
        } catch (Exception | Throwable $e) {
            return false;
        }
    }
}