WC_Product::set_gallery_image_ids PHP Method

    public function set_gallery_image_ids($image_ids)
    {
        $this->set_prop('gallery_image_ids', array_filter(array_filter($image_ids), 'wp_attachment_is_image'));
    }

 /**
  * Save product images
  *
  * @since  2.2
  * @param WC_Product $product
  * @param  array $images
  * @throws WC_API_Exception
  */
 protected function save_product_images($product, $images)
 {
     if (is_array($images)) {
         $gallery = array();
         foreach ($images as $image) {
             if (isset($image['position']) && 0 == $image['position']) {
                 $attachment_id = isset($image['id']) ? absint($image['id']) : 0;
                 if (0 === $attachment_id && isset($image['src'])) {
                     $upload = $this->upload_product_image(esc_url_raw($image['src']));
                     if (is_wp_error($upload)) {
                         throw new WC_API_Exception('woocommerce_api_cannot_upload_product_image', $upload->get_error_message(), 400);
                     }
                     $attachment_id = $this->set_product_image_as_attachment($upload, $product->get_id());
                 }
                 $product->set_image_id($attachment_id);
             } else {
                 $attachment_id = isset($image['id']) ? absint($image['id']) : 0;
                 if (0 === $attachment_id && isset($image['src'])) {
                     $upload = $this->upload_product_image(esc_url_raw($image['src']));
                     if (is_wp_error($upload)) {
                         throw new WC_API_Exception('woocommerce_api_cannot_upload_product_image', $upload->get_error_message(), 400);
                     }
                     $gallery[] = $this->set_product_image_as_attachment($upload, $id);
                 } else {
                     $gallery[] = $attachment_id;
                 }
             }
         }
         if (!empty($gallery)) {
             $product->set_gallery_image_ids($gallery);
         }
     } else {
         $product->set_image_id('');
         $product->set_gallery_image_ids(array());
     }
     return $product;
 }