// prior to wordpress 4.5.0 $args = array( 'number' => $number, 'orderby' => $orderby, 'order' => $order, 'hide_empty' => $hide_empty, 'include' => $ids ); $product_categories = get_terms( 'product_cat', $args ); // since wordpress 4.5.0 $args = array( 'taxonomy' => "product_cat", 'number' => $number, 'orderby' => $orderby, 'order' => $order, 'hide_empty' => $hide_empty, 'include' => $ids ); $product_categories = get_terms($args);