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<?php
$product_cats = get_terms( 'product_cat', $args );
  
  $count = count($product_cats);
  for ($i=0; $i<$count; $i++) { 
   $product_cats[$i]->order_num = get_option('product_cat_order_num_' . $product_cats[$i]->term_id);
  }
  usort($product_cats, 'my_sort_terms_function');

/**
 * TODO: заменить на strcmp
 */
function my_sort_terms_function($a, $b) {
    // this function expects that items to be sorted are objects and
    // that the property to sort by is $object->sort_order
    if ($a->order_num == $b->order_num) {
   return 0;
    } elseif ($a->order_num < $b->order_num) {
   return -1;
    } else {
   return 1;
    }
  }
  ?>