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/*** Add to Child Theme functions.php to show media caption under product thumbnails in the WooCommerce Product Gallery. ***/
 
add_filter('woocommerce_single_product_image_thumbnail_html', function($html, $attachment_id) {
  $caption = get_post_field('post_excerpt', $attachment_id);

  if(trim($caption)) {
    $html = str_replace('</div>', '<span class="gtnCaps">' . $caption . '</span></div>', $html);
  }

  return $html;