get_shipping_class() public method

Returns the product shipping class SLUG.
public get_shipping_class ( ) : string
return string
 /**
  * Get standard product data that applies to every product type
  *
  * @since 2.1
  * @param WC_Product $product
  * @return array
  */
 private function get_product_data($product)
 {
     return array('title' => $product->get_name(), 'id' => $product->get_id(), 'created_at' => $this->server->format_datetime($product->get_date_created(), false, true), 'updated_at' => $this->server->format_datetime($product->get_date_modified(), false, true), 'type' => $product->get_type(), 'status' => $product->get_status(), 'downloadable' => $product->is_downloadable(), 'virtual' => $product->is_virtual(), 'permalink' => $product->get_permalink(), 'sku' => $product->get_sku(), 'price' => wc_format_decimal($product->get_price(), 2), 'regular_price' => wc_format_decimal($product->get_regular_price(), 2), 'sale_price' => $product->get_sale_price() ? wc_format_decimal($product->get_sale_price(), 2) : null, 'price_html' => $product->get_price_html(), 'taxable' => $product->is_taxable(), 'tax_status' => $product->get_tax_status(), 'tax_class' => $product->get_tax_class(), 'managing_stock' => $product->managing_stock(), 'stock_quantity' => $product->get_stock_quantity(), 'in_stock' => $product->is_in_stock(), 'backorders_allowed' => $product->backorders_allowed(), 'backordered' => $product->is_on_backorder(), 'sold_individually' => $product->is_sold_individually(), 'purchaseable' => $product->is_purchasable(), 'featured' => $product->is_featured(), 'visible' => $product->is_visible(), 'catalog_visibility' => $product->get_catalog_visibility(), 'on_sale' => $product->is_on_sale(), 'weight' => $product->get_weight() ? wc_format_decimal($product->get_weight(), 2) : null, 'dimensions' => array('length' => $product->get_length(), 'width' => $product->get_width(), 'height' => $product->get_height(), 'unit' => get_option('woocommerce_dimension_unit')), 'shipping_required' => $product->needs_shipping(), 'shipping_taxable' => $product->is_shipping_taxable(), 'shipping_class' => $product->get_shipping_class(), 'shipping_class_id' => 0 !== $product->get_shipping_class_id() ? $product->get_shipping_class_id() : null, 'description' => apply_filters('the_content', $product->get_description()), 'short_description' => apply_filters('woocommerce_short_description', $product->get_short_description()), 'reviews_allowed' => $product->get_reviews_allowed(), 'average_rating' => wc_format_decimal($product->get_average_rating(), 2), 'rating_count' => $product->get_rating_count(), 'related_ids' => array_map('absint', array_values(wc_get_related_products($product->get_id()))), 'upsell_ids' => array_map('absint', $product->get_upsell_ids()), 'cross_sell_ids' => array_map('absint', $product->get_cross_sell_ids()), 'categories' => wc_get_object_terms($product->get_id(), 'product_cat', 'name'), 'tags' => wc_get_object_terms($product->get_id(), 'product_tag', 'name'), 'images' => $this->get_images($product), 'featured_src' => wp_get_attachment_url(get_post_thumbnail_id($product->get_id())), 'attributes' => $this->get_attributes($product), 'downloads' => $this->get_downloads($product), 'download_limit' => $product->get_download_limit(), 'download_expiry' => $product->get_download_expiry(), 'download_type' => 'standard', 'purchase_note' => apply_filters('the_content', $product->get_purchase_note()), 'total_sales' => $product->get_total_sales(), 'variations' => array(), 'parent' => array());
 }
 /**
  * Get standard product data that applies to every product type
  *
  * @since 2.1
  * @param WC_Product $product
  * @return WC_Product
  */
 private function get_product_data($product)
 {
     return array('title' => $product->get_title(), 'id' => (int) $product->is_type('variation') ? $product->get_variation_id() : $product->id, 'created_at' => $this->server->format_datetime($product->get_post_data()->post_date_gmt), 'updated_at' => $this->server->format_datetime($product->get_post_data()->post_modified_gmt), 'type' => $product->product_type, 'status' => $product->get_post_data()->post_status, 'downloadable' => $product->is_downloadable(), 'virtual' => $product->is_virtual(), 'permalink' => $product->get_permalink(), 'sku' => $product->get_sku(), 'price' => $product->get_price(), 'regular_price' => $product->get_regular_price(), 'sale_price' => $product->get_sale_price() ? $product->get_sale_price() : null, 'price_html' => $product->get_price_html(), 'taxable' => $product->is_taxable(), 'tax_status' => $product->get_tax_status(), 'tax_class' => $product->get_tax_class(), 'managing_stock' => $product->managing_stock(), 'stock_quantity' => $product->get_stock_quantity(), 'in_stock' => $product->is_in_stock(), 'backorders_allowed' => $product->backorders_allowed(), 'backordered' => $product->is_on_backorder(), 'sold_individually' => $product->is_sold_individually(), 'purchaseable' => $product->is_purchasable(), 'featured' => $product->is_featured(), 'visible' => $product->is_visible(), 'catalog_visibility' => $product->visibility, 'on_sale' => $product->is_on_sale(), 'product_url' => $product->is_type('external') ? $product->get_product_url() : '', 'button_text' => $product->is_type('external') ? $product->get_button_text() : '', 'weight' => $product->get_weight() ? $product->get_weight() : null, 'dimensions' => array('length' => $product->length, 'width' => $product->width, 'height' => $product->height, 'unit' => get_option('woocommerce_dimension_unit')), 'shipping_required' => $product->needs_shipping(), 'shipping_taxable' => $product->is_shipping_taxable(), 'shipping_class' => $product->get_shipping_class(), 'shipping_class_id' => 0 !== $product->get_shipping_class_id() ? $product->get_shipping_class_id() : null, 'description' => wpautop(do_shortcode($product->get_post_data()->post_content)), 'short_description' => apply_filters('woocommerce_short_description', $product->get_post_data()->post_excerpt), 'reviews_allowed' => 'open' === $product->get_post_data()->comment_status, 'average_rating' => wc_format_decimal($product->get_average_rating(), 2), 'rating_count' => (int) $product->get_rating_count(), 'related_ids' => array_map('absint', array_values($product->get_related())), 'upsell_ids' => array_map('absint', $product->get_upsells()), 'cross_sell_ids' => array_map('absint', $product->get_cross_sells()), 'parent_id' => $product->post->post_parent, 'categories' => wp_get_post_terms($product->id, 'product_cat', array('fields' => 'names')), 'tags' => wp_get_post_terms($product->id, 'product_tag', array('fields' => 'names')), 'images' => $this->get_images($product), 'featured_src' => (string) wp_get_attachment_url(get_post_thumbnail_id($product->is_type('variation') ? $product->variation_id : $product->id)), 'attributes' => $this->get_attributes($product), 'downloads' => $this->get_downloads($product), 'download_limit' => (int) $product->download_limit, 'download_expiry' => (int) $product->download_expiry, 'download_type' => $product->download_type, 'purchase_note' => wpautop(do_shortcode(wp_kses_post($product->purchase_note))), 'total_sales' => metadata_exists('post', $product->id, 'total_sales') ? (int) get_post_meta($product->id, 'total_sales', true) : 0, 'variations' => array(), 'parent' => array(), 'grouped_products' => array());
 }
 /**
  * Get the shipping class, and if not set, get the shipping class of the parent.
  *
  * @access public
  * @return string
  */
 public function get_shipping_class()
 {
     if (!$this->variation_shipping_class) {
         $classes = get_the_terms($this->variation_id, 'product_shipping_class');
         if ($classes && !is_wp_error($classes)) {
             $this->variation_shipping_class = esc_attr(current($classes)->slug);
         } else {
             $this->variation_shipping_class = parent::get_shipping_class();
         }
     }
     return $this->variation_shipping_class;
 }
 /**
  * Get standard product data that applies to every product type
  *
  * @since 2.1
  * @param WC_Product $product
  * @return WC_Product
  */
 private function get_product_data($product, $fields = null)
 {
     if ($fields) {
         $field_list = explode(',', $fields);
     }
     $product_data = array();
     if (!$fields || $fields && in_array('title', $field_list)) {
         $product_data['title'] = $product->get_title();
     }
     if (!$fields || $fields && in_array('id', $field_list)) {
         $product_data['id'] = (int) $product->is_type('variation') ? $product->get_variation_id() : $product->id;
     }
     if (!$fields || $fields && in_array('created_at', $field_list)) {
         $product_data['created_at'] = $this->server->format_datetime($product->get_post_data()->post_date_gmt);
     }
     if (!$fields || $fields && in_array('updated_at', $field_list)) {
         $product_data['updated_at'] = $this->server->format_datetime($product->get_post_data()->post_modified_gmt);
     }
     if (!$fields || $fields && in_array('type', $field_list)) {
         $product_data['type'] = $product->product_type;
     }
     if (!$fields || $fields && in_array('status', $field_list)) {
         $product_data['status'] = $product->get_post_data()->post_status;
     }
     if (!$fields || $fields && in_array('downloadable', $field_list)) {
         $product_data['downloadable'] = $product->is_downloadable();
     }
     if (!$fields || $fields && in_array('virtual', $field_list)) {
         $product_data['virtual'] = $product->is_virtual();
     }
     if (!$fields || $fields && in_array('permalink', $field_list)) {
         $product_data['permalink'] = $product->get_permalink();
     }
     if (!$fields || $fields && in_array('sku', $field_list)) {
         $product_data['sku'] = $product->get_sku();
     }
     if (!$fields || $fields && in_array('price', $field_list)) {
         $product_data['price'] = $product->get_price();
     }
     if (!$fields || $fields && in_array('regular_price', $field_list)) {
         $product_data['regular_price'] = $product->get_regular_price();
     }
     if (!$fields || $fields && in_array('sale_price', $field_list)) {
         $product_data['sale_price'] = $product->get_sale_price() ? $product->get_sale_price() : null;
     }
     if (!$fields || $fields && in_array('price_html', $field_list)) {
         $product_data['price_html'] = $product->get_price_html();
     }
     if (!$fields || $fields && in_array('taxable', $field_list)) {
         $product_data['taxable'] = $product->is_taxable();
     }
     if (!$fields || $fields && in_array('tax_status', $field_list)) {
         $product_data['tax_status'] = $product->get_tax_status();
     }
     if (!$fields || $fields && in_array('tax_class', $field_list)) {
         $product_data['tax_class'] = $product->get_tax_class();
     }
     if (!$fields || $fields && in_array('managing_stock', $field_list)) {
         $product_data['managing_stock'] = $product->managing_stock();
     }
     if (!$fields || $fields && in_array('stock_quantity', $field_list)) {
         $product_data['stock_quantity'] = $product->get_stock_quantity();
     }
     if (!$fields || $fields && in_array('in_stock', $field_list)) {
         $product_data['in_stock'] = $product->is_in_stock();
     }
     if (!$fields || $fields && in_array('backorders_allowed', $field_list)) {
         $product_data['backorders_allowed'] = $product->backorders_allowed();
     }
     if (!$fields || $fields && in_array('backordered', $field_list)) {
         $product_data['backordered'] = $product->is_on_backorder();
     }
     if (!$fields || $fields && in_array('sold_individually', $field_list)) {
         $product_data['sold_individually'] = $product->is_sold_individually();
     }
     if (!$fields || $fields && in_array('purchaseable', $field_list)) {
         $product_data['purchaseable'] = $product->is_purchasable();
     }
     if (!$fields || $fields && in_array('featured', $field_list)) {
         $product_data['featured'] = $product->is_featured();
     }
     if (!$fields || $fields && in_array('visible', $field_list)) {
         $product_data['visible'] = $product->is_visible();
     }
     if (!$fields || $fields && in_array('catalog_visibility', $field_list)) {
         $product_data['catalog_visibility'] = $product->visibility;
     }
     if (!$fields || $fields && in_array('on_sale', $field_list)) {
         $product_data['on_sale'] = $product->is_on_sale();
     }
     if (!$fields || $fields && in_array('product_url', $field_list)) {
         $product_data['product_url'] = $product->is_type('external') ? $product->get_product_url() : '';
     }
     if (!$fields || $fields && in_array('button_text', $field_list)) {
         $product_data['button_text'] = $product->is_type('external') ? $product->get_button_text() : '';
     }
     if (!$fields || $fields && in_array('weight', $field_list)) {
         $product_data['weight'] = $product->get_weight() ? $product->get_weight() : null;
     }
     if (!$fields || $fields && in_array('dimensions', $field_list)) {
         $product_data['dimensions'] = array('length' => $product->length, 'width' => $product->width, 'height' => $product->height, 'unit' => get_option('woocommerce_dimension_unit'));
     }
     if (!$fields || $fields && in_array('shipping_required', $field_list)) {
         $product_data['shipping_required'] = $product->needs_shipping();
     }
     if (!$fields || $fields && in_array('shipping_taxable', $field_list)) {
         $product_data['shipping_taxable'] = $product->is_shipping_taxable();
     }
     if (!$fields || $fields && in_array('shipping_class', $field_list)) {
         $product_data['shipping_class'] = $product->get_shipping_class();
     }
     if (!$fields || $fields && in_array('shipping_class_id', $field_list)) {
         $product_data['shipping_class_id'] = 0 !== $product->get_shipping_class_id() ? $product->get_shipping_class_id() : null;
     }
     if (!$fields || $fields && in_array('description', $field_list)) {
         $product_data['description'] = wpautop(do_shortcode($product->get_post_data()->post_content));
     }
     if (!$fields || $fields && in_array('short_description', $field_list)) {
         $product_data['short_description'] = apply_filters('woocommerce_short_description', $product->get_post_data()->post_excerpt);
     }
     if (!$fields || $fields && in_array('reviews_allowed', $field_list)) {
         $product_data['reviews_allowed'] = 'open' === $product->get_post_data()->comment_status;
     }
     if (!$fields || $fields && in_array('average_rating', $field_list)) {
         $product_data['average_rating'] = wc_format_decimal($product->get_average_rating(), 2);
     }
     if (!$fields || $fields && in_array('rating_count', $field_list)) {
         $product_data['rating_count'] = (int) $product->get_rating_count();
     }
     if (!$fields || $fields && in_array('related_ids', $field_list)) {
         $product_data['related_ids'] = array_map('absint', array_values($product->get_related()));
     }
     if (!$fields || $fields && in_array('upsell_ids', $field_list)) {
         $product_data['upsell_ids'] = array_map('absint', $product->get_upsells());
     }
     if (!$fields || $fields && in_array('cross_sell_ids', $field_list)) {
         $product_data['cross_sell_ids'] = array_map('absint', $product->get_cross_sells());
     }
     if (!$fields || $fields && in_array('parent_id', $field_list)) {
         $product_data['parent_id'] = $product->post->post_parent;
     }
     if (!$fields || $fields && in_array('categories', $field_list)) {
         $product_data['categories'] = wp_get_post_terms($product->id, 'product_cat', array('fields' => 'names'));
     }
     if (!$fields || $fields && in_array('tags', $field_list)) {
         $product_data['tags'] = wp_get_post_terms($product->id, 'product_tag', array('fields' => 'names'));
     }
     if (!$fields || $fields && in_array('images', $field_list)) {
         $product_data['images'] = $this->get_images($product);
     }
     if (!$fields || $fields && in_array('featured_src', $field_list)) {
         $product_data['featured_src'] = (string) wp_get_attachment_url(get_post_thumbnail_id($product->is_type('variation') ? $product->variation_id : $product->id));
     }
     if (!$fields || $fields && in_array('attributes', $field_list)) {
         $product_data['attributes'] = $this->get_attributes($product);
     }
     if (!$fields || $fields && in_array('downloads', $field_list)) {
         $product_data['downloads'] = $this->get_downloads($product);
     }
     if (!$fields || $fields && in_array('download_limit', $field_list)) {
         $product_data['download_limit'] = (int) $product->download_limit;
     }
     if (!$fields || $fields && in_array('download_expiry', $field_list)) {
         $product_data['download_expiry'] = (int) $product->download_expiry;
     }
     if (!$fields || $fields && in_array('download_type', $field_list)) {
         $product_data['download_type'] = $product->download_type;
     }
     if (!$fields || $fields && in_array('purchase_note', $field_list)) {
         $product_data['purchase_note'] = wpautop(do_shortcode(wp_kses_post($product->purchase_note)));
     }
     if (!$fields || $fields && in_array('total_sales', $field_list)) {
         $product_data['total_sales'] = metadata_exists('post', $product->id, 'total_sales') ? (int) get_post_meta($product->id, 'total_sales', true) : 0;
     }
     if (!$fields || $fields && in_array('variations', $field_list)) {
         $product_data['variations'] = array();
     }
     if (!$fields || $fields && in_array('parent', $field_list)) {
         $product_data['parent'] = array();
     }
     if (!$fields || $fields && in_array('grouped_products', $field_list)) {
         $product_data['grouped_products'] = array();
     }
     if (!$fields || $fields && in_array('menu_order', $field_list)) {
         $product_data['menu_order'] = $product->post->menu_order;
     }
     return $product_data;
 }