WooCommerce - Display subcategories only on main category

category-manufacturer-or-subcategories.php

<?php
// This function is used to display manufactures of products
// With ACF create a true/false field "show_manufacturer"
// Create main categories and subcategories (manufactures) and add a logo

/**
 * Display subcategories of a main category - using ACF fields
 * @author      Pascal Lehnert
 * @copyright   2021-02-28
 */

add_action( 'woocommerce_archive_description', 'DLM_wc_archive_add_sub_categories_images', 15 );

function DLM_wc_archive_add_sub_categories_images() {
    if ( ! is_product_category() ) return false;

    $category = get_queried_object();
    $term_id  = $category->term_id;
    $taxonomy = 'product_cat';

    // Get subcategories of the current category
    $terms = get_terms([
        'taxonomy'    => $taxonomy,
        'hide_empty'  => false,
        'parent'      => get_queried_object_id()
    ]); 

    if ( !get_field('show_manufacturer', $category) ) {
        return;
    }



    $list_items = '';

    // Loop through product subcategories WP_Term Objects
    foreach ($terms as $term) {
        $term_link = get_term_link($term, $taxonomy);
        $thumbnail_id = get_term_meta($term->term_id, 'thumbnail_id', true);
        $image_url = wp_get_attachment_url($thumbnail_id);

        $list_items .= '<li class="col-6 col-sm-4 col-md-3 cat-img cat-'. $term->slug .'"><a href="'. $term_link .'"><img src="'. $image_url .'" alt="'. $term->name .'">'. $term->name .'</a></li>';
    }
    ?>

    <div class="container subcategories-wrapper">

        <h4><?php esc_html_e( sprintf( 'Unsere %s Marken:', $category->name ) , 'my_theme' ); ?></h4>

        <ul class="subcategories-list row">
            <?php echo $list_items; ?>
        </ul>

    </div><!-- end .container -->

<?php
}