<?php

// === GET PRODUCTS BY CATEGORY 
    $args = array(
        // 'number'     => $number,
        'orderby'   => 'title',
        'order'     => 'ASC',
        'hide_empty' => true,
        // 'include'   => $ids
    );

    $product_categories = get_terms( 'product_cat', $args );

    $count = count($product_categories);

    if ( $count > 0 ){
        foreach ( $product_categories as $product_category ) {
            echo '<h4><a href="' . get_term_link( $product_category ) . '">' . $product_category->name . '</a></h4>';   
            
            $args = array(
                'posts_per_page' => -1,
                'tax_query' => array(
                    'relation' => 'AND',
                    array(
                        'taxonomy' => 'product_cat',
                        'field' => 'slug',
                        // 'terms' => 'white-wines'
                        'terms' => $product_category->slug
                    )

                ),
                'post_type' => 'product',
                'orderby' => 'title,'
            );

            $products = new WP_Query( $args );

            echo "<ul>";

                while ( $products->have_posts() ) {
                    $products->the_post();
                    ?>
                    <li>
                        <a href="<?php the_permalink(); ?>">
                            <?php the_title(); ?>
                        </a>
                    </li>

                    <?php
                }
            echo "</ul>";
            }
    }

?>