<?php

/**

* WooCommerce cart

*

* The WooCommerce cart class stores cart data and active coupons as well as handling customer sessions and some cart related urls.

* The cart class also has a price calculation function which calls upon other classes to calculate totals.

*

* @package WooCommerce\Classes

* @version 2.1.0

*/

use Automattic\WooCommerce\Blocks\Utils\CartCheckoutUtils;

use Automattic\WooCommerce\Enums\ProductStatus;

use Automattic\WooCommerce\Enums\ProductType;

use Automattic\WooCommerce\Utilities\DiscountsUtil;

use Automattic\WooCommerce\Utilities\NumberUtil;

use Automattic\WooCommerce\Utilities\ShippingUtil;

use Automattic\WooCommerce\StoreApi\Utilities\LocalPickupUtils;

defined( 'ABSPATH' ) || exit;

require_once WC_ABSPATH . 'includes/legacy/class-wc-legacy-cart.php';

require_once WC_ABSPATH . 'includes/class-wc-cart-fees.php';

require_once WC_ABSPATH . 'includes/class-wc-cart-session.php';

/**

* WC_Cart class.

*/

class WC_Cart extends WC_Legacy_Cart {

/**

* Cart context, used to determine if the cart is being used in a StoreAPI or shortcode context. This should only

* be used internally.

*

* @var string shortcode|store-api

*/

public $cart_context = 'shortcode';

/**

* Contains an array of cart items.

*

* @var array

*/

public $cart_contents = array();

/**

* Contains an array of removed cart items so we can restore them if needed.

*

* @var array

*/

public $removed_cart_contents = array();

/**

* Contains an array of coupon codes applied to the cart.

*

* @var array

*/

public $applied_coupons = array();

/**

* This stores the chosen shipping methods for the cart item packages.

*

* @var array

*/

protected $shipping_methods;

/**

* Whether the shipping totals have been calculated. This will only return true if shipping was calculated, not if

* shipping is disabled or if there are no cart contents.

*

* @var bool

*/

protected $has_calculated_shipping = false;

/**

* Total defaults used to reset.

*

* @var array

*/

protected $default_totals = array(

'subtotal' => 0,

'subtotal_tax' => 0,

'shipping_total' => 0,

'shipping_tax' => 0,

'shipping_taxes' => array(),

'discount_total' => 0,

'discount_tax' => 0,

'cart_contents_total' => 0,

'cart_contents_tax' => 0,

'cart_contents_taxes' => array(),

'fee_total' => 0,

'fee_tax' => 0,

'fee_taxes' => array(),

'total' => 0,

'total_tax' => 0,

);

/**

* Store calculated totals.

*

* @var array

*/

protected $totals = array();

/**

* Reference to the cart session handling class.

*

* @var WC_Cart_Session

*/

protected $session;

/**

* Reference to the cart fees API class.

*

* @var WC_Cart_Fees

*/

protected $fees_api;

/**

* Constructor for the cart class. Loads options and hooks in the init method.

*/

public function __construct() {

$this->session = new WC_Cart_Session( $this );

$this->fees_api = new WC_Cart_Fees();

// Register hooks for the objects.

$this->session->init();

add_action( 'woocommerce_add_to_cart', array( $this, 'calculate_totals' ), 20, 0 );

add_action( 'woocommerce_applied_coupon', array( $this, 'calculate_totals' ), 20, 0 );

add_action( 'woocommerce_removed_coupon', array( $this, 'calculate_totals' ), 20, 0 );

add_action( 'woocommerce_cart_item_removed', array( $this, 'calculate_totals' ), 20, 0 );

add_action( 'woocommerce_cart_item_restored', array( $this, 'calculate_totals' ), 20, 0 );

add_action( 'woocommerce_check_cart_items', array( $this, 'check_cart_items' ), 1 );

add_action( 'woocommerce_check_cart_items', array( $this, 'check_cart_coupons' ), 1 );

add_action( 'woocommerce_after_checkout_validation', array( $this, 'check_customer_coupons' ), 1, 2 );

}

/**

* When cloning, ensure object properties are handled.

*

* These properties store a reference to the cart, so we use new instead of clone.

*/

public function __clone() {

$this->session = clone $this->session;

$this->fees_api = clone $this->fees_api;

$this->session->set_cart( $this );

}

/*

|--------------------------------------------------------------------------

| Getters.

|--------------------------------------------------------------------------

|

| Methods to retrieve class properties and avoid direct access.

*/

/**

* Gets cart contents.

*

* @since 3.2.0

* @return array of cart items

*/

public function get_cart_contents() {

return apply_filters( 'woocommerce_get_cart_contents', (array) $this->cart_contents );

}

/**

* Return items removed from the cart.

*

* @since 3.2.0

* @return array

*/

public function get_removed_cart_contents() {

return (array) $this->removed_cart_contents;

}

/**

* Gets the array of applied coupon codes.

*

* @return array of applied coupons

*/

public function get_applied_coupons() {

return (array) $this->applied_coupons;

}

/**

* Return all calculated coupon totals.

*

* @since 3.2.0

* @return array

*/

public function get_coupon_discount_totals() {

return (array) $this->coupon_discount_totals;

}

/**

* Return all calculated coupon tax totals.

*

* @since 3.2.0

* @return array

*/

public function get_coupon_discount_tax_totals() {

return (array) $this->coupon_discount_tax_totals;

}

/**

* Return all calculated totals.

*

* @since 3.2.0

* @return array

*/

public function get_totals() {

return empty( $this->totals ) ? $this->default_totals : $this->totals;

}

/**

* Get a total.

*

* @since 3.2.0

* @param string $key Key of element in $totals array.

* @return mixed

*/

protected function get_totals_var( $key ) {

return isset( $this->totals[ $key ] ) ? $this->totals[ $key ] : $this->default_totals[ $key ];

}

/**

* Get subtotal.

*

* @since 3.2.0

* @return float

*/

public function get_subtotal() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'subtotal' ) );

}

/**

* Get subtotal_tax.

*

* @since 3.2.0

* @return float

*/

public function get_subtotal_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'subtotal_tax' ) );

}

/**

* Get discount_total.

*

* @since 3.2.0

* @return float

*/

public function get_discount_total() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'discount_total' ) );

}

/**

* Get discount_tax.

*

* @since 3.2.0

* @return float

*/

public function get_discount_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'discount_tax' ) );

}

/**

* Get shipping_total.

*

* @since 3.2.0

* @return float

*/

public function get_shipping_total() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'shipping_total' ) );

}

/**

* Get shipping_tax.

*

* @since 3.2.0

* @return float

*/

public function get_shipping_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'shipping_tax' ) );

}

/**

* Gets cart total. This is the total of items in the cart, but after discounts. Subtotal is before discounts.

*

* @since 3.2.0

* @return float|string|int

*/

public function get_cart_contents_total() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'cart_contents_total' ) );

}

/**

* Gets cart tax amount.

*

* @since 3.2.0

* @return float

*/

public function get_cart_contents_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'cart_contents_tax' ) );

}

/**

* Gets cart total after calculation.

*

* @since 3.2.0

* @param string $context If the context is view, the value will be formatted for display. This keeps it compatible with pre-3.2 versions.

* @return float|string

*/

public function get_total( $context = 'view' ) {

$total = apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'total' ) );

return 'view' === $context ? apply_filters( 'woocommerce_cart_total', wc_price( $total ) ) : $total;

}

/**

* Get total tax amount.

*

* @since 3.2.0

* @return float

*/

public function get_total_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'total_tax' ) );

}

/**

* Get total fee amount.

*

* @since 3.2.0

* @return float

*/

public function get_fee_total() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'fee_total' ) );

}

/**

* Get total fee tax amount.

*

* @since 3.2.0

* @return float

*/

public function get_fee_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'fee_tax' ) );

}

/**

* Get taxes.

*

* @since 3.2.0

*/

public function get_shipping_taxes() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'shipping_taxes' ) );

}

/**

* Get taxes.

*

* @since 3.2.0

*/

public function get_cart_contents_taxes() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'cart_contents_taxes' ) );

}

/**

* Get taxes.

*

* @since 3.2.0

*/

public function get_fee_taxes() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, $this->get_totals_var( 'fee_taxes' ) );

}

/**

* Return whether or not the cart is displaying prices including tax, rather than excluding tax.

*

* @since 3.3.0

* @return bool

*/

public function display_prices_including_tax() {

return apply_filters( 'woocommerce_cart_' . __FUNCTION__, 'incl' === $this->get_tax_price_display_mode() );

}

/*

|--------------------------------------------------------------------------

| Setters.

|--------------------------------------------------------------------------

|

| Methods to set class properties and avoid direct access.

*/

/**

* Sets the contents of the cart.

*

* @param array $value Cart array.

*/

public function set_cart_contents( $value ) {

$this->cart_contents = (array) $value;

}

/**

* Set items removed from the cart.

*

* @since 3.2.0

* @param array $value Item array.

*/

public function set_removed_cart_contents( $value = array() ) {

$this->removed_cart_contents = (array) $value;

}

/**

* Sets the array of applied coupon codes.

*

* @param array $value List of applied coupon codes.

*/

public function set_applied_coupons( $value = array() ) {

$this->applied_coupons = (array) $value;

}

/**

* Sets the array of calculated coupon totals.

*

* @since 3.2.0

* @param array $value Value to set.

*/

public function set_coupon_discount_totals( $value = array() ) {

$this->coupon_discount_totals = (array) $value;

}

/**

* Sets the array of calculated coupon tax totals.

*

* @since 3.2.0

* @param array $value Value to set.

*/

public function set_coupon_discount_tax_totals( $value = array() ) {

$this->coupon_discount_tax_totals = (array) $value;

}

/**

* Set all calculated totals.

*

* @since 3.2.0

* @param array $value Value to set.

*/

public function set_totals( $value = array() ) {

$this->totals = wp_parse_args( $value, $this->default_totals );

}

/**

* Set subtotal.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_subtotal( $value ) {

$this->totals['subtotal'] = wc_format_decimal( $value );

}

/**

* Set subtotal.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_subtotal_tax( $value ) {

$this->totals['subtotal_tax'] = $value;

}

/**

* Set discount_total.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_discount_total( $value ) {

$this->totals['discount_total'] = $value;

}

/**

* Set discount_tax.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_discount_tax( $value ) {

$this->totals['discount_tax'] = $value;

}

/**

* Set shipping_total.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_shipping_total( $value ) {

$this->totals['shipping_total'] = wc_format_decimal( $value );

}

/**

* Set shipping_tax.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_shipping_tax( $value ) {

$this->totals['shipping_tax'] = $value;

}

/**

* Set cart_contents_total.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_cart_contents_total( $value ) {

$this->totals['cart_contents_total'] = wc_format_decimal( $value );

}

/**

* Set cart tax amount.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_cart_contents_tax( $value ) {

$this->totals['cart_contents_tax'] = $value;

}

/**

* Set cart total.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_total( $value ) {

$this->totals['total'] = wc_format_decimal( $value, wc_get_price_decimals() );

}

/**

* Set total tax amount.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_total_tax( $value ) {

// We round here because this is a total entry, as opposed to line items in other setters.

$this->totals['total_tax'] = wc_round_tax_total( $value );

}

/**

* Set fee amount.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_fee_total( $value ) {

$this->totals['fee_total'] = wc_format_decimal( $value );

}

/**

* Set fee tax.

*

* @since 3.2.0

* @param string $value Value to set.

*/

public function set_fee_tax( $value ) {

$this->totals['fee_tax'] = $value;

}

/**

* Set taxes.

*

* @since 3.2.0

* @param array $value Tax values.

*/

public function set_shipping_taxes( $value ) {

$this->totals['shipping_taxes'] = (array) $value;

}

/**

* Set taxes.

*

* @since 3.2.0

* @param array $value Tax values.

*/

public function set_cart_contents_taxes( $value ) {

$this->totals['cart_contents_taxes'] = (array) $value;

}

/**

* Set taxes.

*

* @since 3.2.0

* @param array $value Tax values.

*/

public function set_fee_taxes( $value ) {

$this->totals['fee_taxes'] = (array) $value;

}

/*

|--------------------------------------------------------------------------

| Helper methods.

|--------------------------------------------------------------------------

*/

/**

* Returns the cart and shipping taxes, merged.

*

* @return array merged taxes

*/

public function get_taxes() {

return apply_filters( 'woocommerce_cart_get_taxes', wc_array_merge_recursive_numeric( $this->get_shipping_taxes(), $this->get_cart_contents_taxes(), $this->get_fee_taxes() ), $this );

}

/**

* Returns the contents of the cart in an array.

*

* @return array contents of the cart

*/

public function get_cart() {

if ( ! did_action( 'wp_loaded' ) ) {

wc_doing_it_wrong( __FUNCTION__, __( 'Get cart should not be called before the wp_loaded action.', 'woocommerce' ), '2.3' );

}

if ( ! did_action( 'woocommerce_load_cart_from_session' ) ) {

$this->session->get_cart_from_session();

}

return array_filter( $this->get_cart_contents() );

}

/**

* Returns a specific item in the cart.

*

* @param string $item_key Cart item key.

* @return array Item data

*/

public function get_cart_item( $item_key ) {

return isset( $this->cart_contents[ $item_key ] ) ? $this->cart_contents[ $item_key ] : array();

}

/**

* Checks if the cart is empty.

*

* @return bool

*/

public function is_empty() {

return 0 === count( $this->get_cart() );

}

/**

* Empties the cart and optionally the persistent cart too.

*

* @since 9.7.0 Also clears shipping methods and packages since the items they are linked to are cleared.

*

* @param bool $clear_persistent_cart Should the persistent cart be cleared too. Defaults to true.

*/

public function empty_cart( $clear_persistent_cart = true ) {

/**

* Fires before the cart is emptied.

*

* @since 9.7.0

*

* @param bool $clear_persistent_cart Whether the persistent cart will be cleared too.

*/

do_action( 'woocommerce_before_cart_emptied', $clear_persistent_cart );

$this->cart_contents = array();

$this->removed_cart_contents = array();

$this->shipping_methods = array();

$this->coupon_discount_totals = array();

$this->coupon_discount_tax_totals = array();

$this->applied_coupons = array();

$this->totals = $this->default_totals;

if ( $clear_persistent_cart ) {

$this->session->persistent_cart_destroy();

}

$this->fees_api->remove_all_fees();

WC()->shipping()->reset_shipping();

/**

* Fires after the cart is emptied.

*

* @since 9.7.0

*

* @param bool $clear_persistent_cart Whether the persistent cart was cleared too.

*/

do_action( 'woocommerce_cart_emptied', $clear_persistent_cart );

}

/**

* Get number of items in the cart.

*

* @return int

*/

public function get_cart_contents_count() {

return apply_filters( 'woocommerce_cart_contents_count', array_sum( wp_list_pluck( $this->get_cart(), 'quantity' ) ) );

}

/**

* Get weight of items in the cart.

*

* @since 2.5.0

* @return float

*/

public function get_cart_contents_weight() {

$weight = 0.0;

foreach ( $this->get_cart() as $values ) {

if ( $values['data']->has_weight() ) {

$weight += (float) $values['data']->get_weight() * $values['quantity'];

}

}

return apply_filters( 'woocommerce_cart_contents_weight', $weight );

}

/**

* Get cart items quantities - merged so we can do accurate stock checks on items across multiple lines.

*

* @return array

*/

public function get_cart_item_quantities() {

$quantities = array();

foreach ( $this->get_cart() as $values ) {

$product = $values['data'];

$quantities[ $product->get_stock_managed_by_id() ] = isset( $quantities[ $product->get_stock_managed_by_id() ] ) ? $quantities[ $product->get_stock_managed_by_id() ] + $values['quantity'] : $values['quantity'];

}

return $quantities;

}

/**

* Check all cart items for errors.

*/

public function check_cart_items() {

$return = true;

$result = $this->check_cart_item_validity();

if ( is_wp_error( $result ) ) {

wc_add_notice( $result->get_error_message(), 'error' );

$return = false;

}

$result = $this->check_cart_item_stock();

if ( is_wp_error( $result ) ) {

wc_add_notice( $result->get_error_message(), 'error' );

$return = false;

}

return $return;

}

/**

* Check cart coupons for errors.

*/

public function check_cart_coupons() {

foreach ( $this->get_applied_coupons() as $code ) {

$coupon = new WC_Coupon( $code );

if ( ! $coupon->is_valid() ) {

$coupon->add_coupon_message( WC_Coupon::E_WC_COUPON_INVALID_REMOVED );

$this->remove_coupon( $code );

}

}

}

/**

* Looks through cart items and checks the posts are not trashed or deleted.

*

* @return bool|WP_Error

*/

public function check_cart_item_validity() {

$return = true;

foreach ( $this->get_cart() as $cart_item_key => $values ) {

$product = $values['data'];

if ( ! $product || ! $product->exists() || ProductStatus::TRASH === $product->get_status() ) {

$this->set_quantity( $cart_item_key, 0 );

$return = new WP_Error( 'invalid', __( 'An item which is no longer available was removed from your cart.', 'woocommerce' ) );

}

}

return $return;

}

/**

* Looks through the cart to check each item is in stock. If not, add an error.

*

* @return bool|WP_Error

*/

public function check_cart_item_stock() {

$error = new WP_Error();

$product_qty_in_cart = $this->get_cart_item_quantities();

$current_session_order_id = isset( WC()->session->order_awaiting_payment ) ? absint( WC()->session->order_awaiting_payment ) : absint( WC()->session->get( 'store_api_draft_order', 0 ) );

foreach ( $this->get_cart() as $values ) {

$product = $values['data'];

// Check stock based on stock-status.

if ( ! $product->is_in_stock() ) {

/* translators: %s: product name */

$error->add( 'out-of-stock', sprintf( __( 'Sorry, "%s" is not in stock. Please edit your cart and try again. We apologize for any inconvenience caused.', 'woocommerce' ), $product->get_name() ) );

return $error;

}

// We only need to check products managing stock, with a limited stock qty.

if ( ! $product->managing_stock() || $product->backorders_allowed() ) {

continue;

}

// Check stock based on all items in the cart and consider any held stock within pending orders.

$held_stock = wc_get_held_stock_quantity( $product, $current_session_order_id );

$required_stock = $product_qty_in_cart[ $product->get_stock_managed_by_id() ];

/**

* Allows filter if product have enough stock to get added to the cart.

*

* @since 4.6.0

* @param bool $has_stock If have enough stock.

* @param WC_Product $product Product instance.

* @param array $values Cart item values.

*/

if ( apply_filters( 'woocommerce_cart_item_required_stock_is_not_enough', $product->get_stock_quantity() < ( $held_stock + $required_stock ), $product, $values ) ) {

/* translators: 1: product name 2: quantity in stock */

$error->add( 'out-of-stock', sprintf( __( 'Sorry, we do not have enough "%1$s" in stock to fulfill your order (%2$s available). We apologize for any inconvenience caused.', 'woocommerce' ), $product->get_name(), wc_format_stock_quantity_for_display( $product->get_stock_quantity() - $held_stock, $product ) ) );

return $error;

}

}

return true;

}

/**

* Gets and formats a list of cart item data + variations for display on the frontend.

*

* @param array $cart_item Cart item object.

* @param bool $flat Should the data be returned flat or in a list.

* @return string

*/

public function get_item_data( $cart_item, $flat = false ) {

wc_deprecated_function( 'WC_Cart::get_item_data', '3.3', 'wc_get_formatted_cart_item_data' );

return wc_get_formatted_cart_item_data( $cart_item, $flat );

}

/**

* Gets cross sells based on the items in the cart.

*

* @return array cross_sells (item ids)

*/

public function get_cross_sells() {

$cross_sells = array();

$in_cart = array();

if ( ! $this->is_empty() ) {

foreach ( $this->get_cart() as $values ) {

if ( $values['quantity'] > 0 ) {

$cross_sells = array_merge( $values['data']->get_cross_sell_ids(), $cross_sells );

$in_cart[] = $values['product_id'];

// Add variations to the in cart array.

if ( $values['data']->is_type( ProductType::VARIATION ) ) {

$in_cart[] = $values['variation_id'];

}

}

}

}

$cross_sells = array_diff( $cross_sells, $in_cart );

return apply_filters( 'woocommerce_cart_crosssell_ids', wp_parse_id_list( $cross_sells ), $this );

}

/**

* Gets the url to remove an item from the cart.

*

* @param string $cart_item_key contains the id of the cart item.

* @return string url to page

*/

public function get_remove_url( $cart_item_key ) {

wc_deprecated_function( 'WC_Cart::get_remove_url', '3.3', 'wc_get_cart_remove_url' );

return wc_get_cart_remove_url( $cart_item_key );

}

/**

* Gets the url to re-add an item into the cart.

*

* @param string $cart_item_key Cart item key to undo.

* @return string url to page

*/

public function get_undo_url( $cart_item_key ) {

wc_deprecated_function( 'WC_Cart::get_undo_url', '3.3', 'wc_get_cart_undo_url' );

return wc_get_cart_undo_url( $cart_item_key );

}

/**

* Get taxes, merged by code, formatted ready for output.

*

* @return array

*/

public function get_tax_totals() {

$shipping_taxes = $this->get_shipping_taxes(); // Shipping taxes are rounded differently, so we will subtract from all taxes, then round and then add them back.

$taxes = $this->get_taxes();

$tax_totals = array();

foreach ( $taxes as $key => $tax ) {

$code = WC_Tax::get_rate_code( $key );

if ( $code || apply_filters( 'woocommerce_cart_remove_taxes_zero_rate_id', 'zero-rated' ) === $key ) {

if ( ! isset( $tax_totals[ $code ] ) ) {

$tax_totals[ $code ] = new stdClass();

$tax_totals[ $code ]->amount = 0;

}

$tax_totals[ $code ]->tax_rate_id = $key;

$tax_totals[ $code ]->is_compound = WC_Tax::is_compound( $key );

$tax_totals[ $code ]->label = WC_Tax::get_rate_label( $key );

if ( isset( $shipping_taxes[ $key ] ) ) {

$tax -= $shipping_taxes[ $key ];

$tax = wc_round_tax_total( $tax );

$tax += NumberUtil::round( $shipping_taxes[ $key ], wc_get_price_decimals() );

unset( $shipping_taxes[ $key ] );

}

$tax_totals[ $code ]->amount += wc_round_tax_total( $tax );

$tax_totals[ $code ]->formatted_amount = wc_price( $tax_totals[ $code ]->amount );

}

}

if ( apply_filters( 'woocommerce_cart_hide_zero_taxes', true ) ) {

$amounts = array_filter( wp_list_pluck( $tax_totals, 'amount' ) );

$tax_totals = array_intersect_key( $tax_totals, $amounts );

}

return apply_filters( 'woocommerce_cart_tax_totals', $tax_totals, $this );

}

/**

* Get all tax classes for items in the cart.

*

* @return array

*/

public function get_cart_item_tax_classes() {

$found_tax_classes = array();

foreach ( $this->get_cart() as $item ) {

if ( $item['data'] && ( $item['data']->is_taxable() || $item['data']->is_shipping_taxable() ) ) {

$found_tax_classes[] = $item['data']->get_tax_class();

}

}

return array_unique( $found_tax_classes );

}

/**

* Get all tax classes for shipping based on the items in the cart.

*

* @return array

*/

public function get_cart_item_tax_classes_for_shipping() {

$found_tax_classes = array();

foreach ( $this->get_cart() as $item ) {

if ( $item['data'] && ( $item['data']->is_shipping_taxable() ) ) {

$found_tax_classes[] = $item['data']->get_tax_class();

}

}

return array_unique( $found_tax_classes );

}

/**

* Determines the value that the customer spent and the subtotal

* displayed, used for things like coupon validation.

*

* Since the coupon lines are displayed based on the TAX DISPLAY value

* of cart, this is used to determine the spend.

*

* If cart totals are shown including tax, use the subtotal.

* If cart totals are shown excluding tax, use the subtotal ex tax

* (tax is shown after coupons).

*

* @since 2.6.0

* @return string

*/

public function get_displayed_subtotal() {

return $this->display_prices_including_tax() ? $this->get_subtotal() + $this->get_subtotal_tax() : $this->get_subtotal();

}

/**

* Check if product is in the cart and return cart item key.

*

* Cart item key will be unique based on the item and its properties, such as variations.

*

* @param mixed $cart_id id of product to find in the cart.