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Edit File: class-wc-shipping-zones.php

<?php
/**
 * Handles storage and retrieval of shipping zones
 *
 * @package WooCommerce\Classes
 * @version 3.3.0
 * @since   2.6.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Shipping zones class.
 */
class WC_Shipping_Zones {

/**
	 * Get shipping zones from the database.
	 *
	 * @since 2.6.0
	 * @param string $context Getting shipping methods for what context. Valid values, admin, json.
	 * @return array Array of arrays.
	 */
	public static function get_zones( $context = 'admin' ) {
		$zone_objects = self::get_shipping_zones();
		$zones        = array();

foreach ( $zone_objects as $zone_object ) {
			$zones[ $zone_object->get_id() ]                            = $zone_object->get_data();
			$zones[ $zone_object->get_id() ]['zone_id']                 = $zone_object->get_id();
			$zones[ $zone_object->get_id() ]['formatted_zone_location'] = $zone_object->get_formatted_location();
			$zones[ $zone_object->get_id() ]['shipping_methods']        = $zone_object->get_shipping_methods( false, $context );
		}

return $zones;
	}

/**
	 * Retrieve Shipping_Zone data objects for the given zone_ids.
	 *
	 * @param array|null $zone_ids The zone_ids of the zones to retrieve. An empty array will return no results. Use null for all zones.
	 *
	 * @return WC_Shipping_Zone[]
	 */
	public static function get_shipping_zones( ?array $zone_ids = null ) {
		$data_store = WC_Data_Store::load( 'shipping-zone' );
		if ( null === $zone_ids ) {
			$raw_zones = $data_store->get_zones();
			$zone_ids  = array_column( $raw_zones, 'zone_id' );
		} elseif ( empty( $zone_ids ) ) {
			return array();
		}

$zones = array();
		foreach ( $zone_ids as $zone_id ) {
			$zone = new WC_Shipping_Zone();
			$zone->set_object_read( false );
			$zone->set_id( $zone_id );
			$zones[ $zone_id ] = $zone;
		}

if ( ! empty( $zones ) ) {
			$data_store->read_multiple( $zones );
		}

return $zones;
	}

/**
	 * Get shipping zone using it's ID
	 *
	 * @since 2.6.0
	 * @param int $zone_id Zone ID.
	 * @return WC_Shipping_Zone|bool
	 */
	public static function get_zone( $zone_id ) {
		return self::get_zone_by( 'zone_id', $zone_id );
	}

/**
	 * Get shipping zone by an ID.
	 *
	 * @since 2.6.0
	 * @param string $by Get by 'zone_id' or 'instance_id'.
	 * @param int    $id ID.
	 * @return WC_Shipping_Zone|bool
	 */
	public static function get_zone_by( $by = 'zone_id', $id = 0 ) {
		$zone_id = false;

switch ( $by ) {
			case 'zone_id':
				$zone_id = $id;
				break;
			case 'instance_id':
				$data_store = WC_Data_Store::load( 'shipping-zone' );
				$zone_id    = $data_store->get_zone_id_by_instance_id( $id );
				break;
		}

if ( false !== $zone_id ) {
			try {
				return new WC_Shipping_Zone( $zone_id );
			} catch ( Exception $e ) {
				return false;
			}
		}

return false;
	}

/**
	 * Get shipping zone using it's ID.
	 *
	 * @since 2.6.0
	 * @param int $instance_id Instance ID.
	 * @return bool|WC_Shipping_Method
	 */
	public static function get_shipping_method( $instance_id ) {
		$data_store          = WC_Data_Store::load( 'shipping-zone' );
		$raw_shipping_method = $data_store->get_method( $instance_id );
		$wc_shipping         = WC_Shipping::instance();
		$allowed_classes     = $wc_shipping->get_shipping_method_class_names();

if ( ! empty( $raw_shipping_method ) && in_array( $raw_shipping_method->method_id, array_keys( $allowed_classes ), true ) ) {
			$class_name = $allowed_classes[ $raw_shipping_method->method_id ];
			if ( is_object( $class_name ) ) {
				$class_name = get_class( $class_name );
			}
			$instance               = new $class_name( $raw_shipping_method->instance_id );
			$instance->enabled      = $raw_shipping_method->is_enabled ? 'yes' : 'no';
			$instance->method_order = (int) $raw_shipping_method->method_order;
			return $instance;
		}
		return false;
	}

/**
	 * Delete a zone using it's ID
	 *
	 * @param int $zone_id Zone ID.
	 * @since 2.6.0
	 */
	public static function delete_zone( $zone_id ) {
		$zone = new WC_Shipping_Zone( $zone_id );
		$zone->delete();
	}

/**
	 * Find a matching zone for a given package.
	 *
	 * @since  2.6.0
	 * @uses   wc_make_numeric_postcode()
	 * @param  array $package Shipping package.
	 * @return WC_Shipping_Zone
	 */
	public static function get_zone_matching_package( $package ) {
		$country          = strtoupper( wc_clean( $package['destination']['country'] ) );
		$state            = strtoupper( wc_clean( $package['destination']['state'] ) );
		$postcode         = wc_normalize_postcode( wc_clean( $package['destination']['postcode'] ) );
		$cache_key        = WC_Cache_Helper::get_cache_prefix( 'shipping_zones' ) . 'wc_shipping_zone_' . md5( sprintf( '%s+%s+%s', $country, $state, $postcode ) );
		$matching_zone_id = wp_cache_get( $cache_key, 'shipping_zones' );

if ( false === $matching_zone_id ) {
			$data_store       = WC_Data_Store::load( 'shipping-zone' );
			$matching_zone_id = $data_store->get_zone_id_from_package( $package );
			wp_cache_set( $cache_key, $matching_zone_id, 'shipping_zones' );
		}

return new WC_Shipping_Zone( $matching_zone_id ? $matching_zone_id : 0 );
	}
}