FAQ Accordion Shortcode With Schema

add_shortcode( 'faq_list', function ( $atts ) {
    $atts = shortcode_atts( array( 'group' => '', 'limit' => 50, 'schema' => 'yes' ), $atts, 'faq_list' );

    if ( ! post_type_exists( 'faq' ) ) {
        return '';
    }

    $args = array(
        'post_type'      => 'faq',
        'posts_per_page' => min( 100, absint( $atts['limit'] ) ),
        'orderby'        => array( 'menu_order' => 'ASC', 'title' => 'ASC' ),
        'no_found_rows'  => true,
    );

    if ( $atts['group'] && taxonomy_exists( 'faq_group' ) ) {
        $args['tax_query'] = array( array( 'taxonomy' => 'faq_group', 'field' => 'slug', 'terms' => sanitize_title( $atts['group'] ) ) );
    }

    $faqs = get_posts( $args );

    if ( ! $faqs ) {
        return '';
    }

    $html   = '<div class="faq-list">';
    $schema = array( '@context' => 'https://schema.org', '@type' => 'FAQPage', 'mainEntity' => array() );

    foreach ( $faqs as $faq ) {
        $answer = wp_kses_post( wpautop( do_shortcode( $faq->post_content ) ) );
        $html  .= '<details class="faq-item"><summary>' . esc_html( get_the_title( $faq ) ) . '</summary><div class="faq-answer">' . $answer . '</div></details>';
        $schema['mainEntity'][] = array(
            '@type'          => 'Question',
            'name'           => wp_strip_all_tags( get_the_title( $faq ) ),
            'acceptedAnswer' => array( '@type' => 'Answer', 'text' => trim( wp_strip_all_tags( $answer, true ) ) ),
        );
    }

    $html .= '</div>';

    if ( 'no' !== $atts['schema'] ) {
        $html .= '<script type="application/ld+json">' . wp_json_encode( $schema, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_HEX_TAG ) . '</script>';
    }

    return $html;
} );