Lista brendova pa proizvoda

<?php
  $brand_list = array();

  $args = array(
      'post_type' => 'product',
      'posts_per_page' => -1,
  );

  $products = new WP_Query($args);

  while ($products->have_posts()) {
      $products->the_post();

      $product = wc_get_product(get_the_ID());
      $brand = $product->get_attribute('pa_proizvodac');

      if (!empty($brand) && !in_array($brand, $brand_list)) {
          $brand_list[] = $brand;
      }
  }

  var_dump($brand_list);

  wp_reset_postdata();

foreach ($brand_list as $brand) {
    echo '<h2>' . $brand . '</h2>';

    $args = array(
        'post_type' => 'product',
        'posts_per_page' => -1,
        'tax_query' => array(
            array(
                'taxonomy' => 'pa_proizvodac',
                'field' => 'slug',
                'terms' => $brand,
            ),
        ),
    );

    $products = new WP_Query($args);
    print_r($args);

    if ($products->have_posts()) {
        while ($products->have_posts()) {
            $products->the_post();
            echo '<br><strong>' . get_the_title() . '</strong>';
        }
    }

    wp_reset_postdata();
}

?>