WordPress Accordion Block w/FAQ Schema

accordion-faqs-schema.php

<?php

// You need to add an `is-faqs` class to the wrapping Accordion block to trigger the
// below markup changes.

add_filter('render_block_core/accordion', function ($content) {
	$processor = new \WP_HTML_Tag_Processor($content);

	if (! $processor->next_tag([ 'class_name' => 'is-faqs' ])) {
		return $processor->get_updated_html();
	}

	$processor->set_attribute('itemscope', true);
	$processor->set_attribute('itemtype', 'https://schema.org/FAQPage');

	while ($processor->next_tag([ 'class_name' => 'wp-block-accordion-item' ])) {
		$processor->set_attribute('itemscope', true);
		$processor->set_attribute('itemprop', 'mainEntity');
		$processor->set_attribute('itemtype', 'https://schema.org/Question');

		if ($processor->next_tag(['class_name' => 'wp-block-accordion-heading__toggle-title'])) {
			$processor->set_attribute('itemprop', 'name');
		}

		if ($processor->next_tag([ 'class_name' => 'wp-block-accordion-panel' ])) {
			$processor->set_attribute('itemscope', true);
			$processor->set_attribute('itemprop', 'acceptedAnswer');
			$processor->set_attribute('itemtype', 'https://schema.org/Answer');

			if ($processor->next_tag('p')) {
				$processor->set_attribute('itemprop', 'text');
			}
		}
	}

	return $processor->get_updated_html();
});