WC_Tax::_update_tax_rate PHP Method

    public static function _update_tax_rate($tax_rate_id, $tax_rate)
    {
        global $wpdb;
        $tax_rate_id = absint($tax_rate_id);
        $wpdb->update($wpdb->prefix . "woocommerce_tax_rates", self::prepare_tax_rate($tax_rate), array('tax_rate_id' => $tax_rate_id));
        WC_Cache_Helper::incr_cache_prefix('taxes');
        do_action('woocommerce_tax_rate_updated', $tax_rate_id, $tax_rate);
    }

 /**
  * Handle submissions from assets/js/settings-views-html-settings-tax.js Backbone model.
  */
 public static function tax_rates_save_changes()
 {
     if (!isset($_POST['current_class'], $_POST['wc_tax_nonce'], $_POST['changes'])) {
         wp_send_json_error('missing_fields');
         exit;
     }
     $current_class = $_POST['current_class'];
     // This is sanitized seven lines later.
     if (!wp_verify_nonce($_POST['wc_tax_nonce'], 'wc_tax_nonce-class:' . $current_class)) {
         wp_send_json_error('bad_nonce');
         exit;
     }
     $current_class = WC_Tax::format_tax_rate_class($current_class);
     // Check User Caps
     if (!current_user_can('manage_woocommerce')) {
         wp_send_json_error('missing_capabilities');
         exit;
     }
     $changes = $_POST['changes'];
     foreach ($changes as $tax_rate_id => $data) {
         if (isset($data['deleted'])) {
             if (isset($data['newRow'])) {
                 // So the user added and deleted a new row.
                 // That's fine, it's not in the database anyways. NEXT!
                 continue;
             }
             WC_Tax::_delete_tax_rate($tax_rate_id);
         }
         $tax_rate = array_intersect_key($data, array('tax_rate_country' => 1, 'tax_rate_state' => 1, 'tax_rate' => 1, 'tax_rate_name' => 1, 'tax_rate_priority' => 1, 'tax_rate_compound' => 1, 'tax_rate_shipping' => 1, 'tax_rate_order' => 1));
         if (isset($data['newRow'])) {
             // Hurrah, shiny and new!
             $tax_rate['tax_rate_class'] = $current_class;
             $tax_rate_id = WC_Tax::_insert_tax_rate($tax_rate);
         } else {
             // Updating an existing rate ...
             if (!empty($tax_rate)) {
                 WC_Tax::_update_tax_rate($tax_rate_id, $tax_rate);
             }
         }
         if (isset($data['postcode'])) {
             WC_Tax::_update_tax_rate_postcodes($tax_rate_id, array_map('wc_clean', $data['postcode']));
         }
         if (isset($data['city'])) {
             WC_Tax::_update_tax_rate_cities($tax_rate_id, array_map('wc_clean', $data['city']));
         }
     }
     wp_send_json_success(array('rates' => WC_Tax::get_rates_for_tax_class($current_class)));
 }