WC_Brands_Coupons::is_coupon_valid │ public │ WC 1.0

Validate the coupon based on included and/or excluded product brands.

If one of the following conditions are met, an exception will be thrown and displayed as an error notice on the cart page:

1) Coupon has a brand requirement but no products in the cart have the brand.
2) All products in the cart match the brand exclusion rule.
3) For a cart discount, there is at least one product in cart that matches exclusion rule.

Method of the class: WC_Brands_Coupons{}

No Hooks.

Returns

true|false. $valid True if coupon is valid, otherwise Exception will be thrown.

Usage

$WC_Brands_Coupons = new WC_Brands_Coupons();
$WC_Brands_Coupons->is_coupon_valid( $valid, $coupon, $discounts );
$valid(true|false) (required)
Whether the coupon is valid.
$coupon(WC_Coupon) (required)
Coupon object.
$discounts(WC_Discounts)
Discounts object.
Default: null

WC_Brands_Coupons::is_coupon_valid() code WC 10.5.0

woocommerce/includes/class-wc-brands-coupons.php 
public function is_coupon_valid( $valid, $coupon, $discounts = null ) {
	$this->set_brand_settings_on_coupon( $coupon );

	// Only check if coupon has brand restrictions on it.
	$brand_coupon_settings = WC_Brands_Brand_Settings_Manager::get_brand_settings_on_coupon( $coupon );

	$brand_restrictions = ! empty( $brand_coupon_settings['included_brands'] ) || ! empty( $brand_coupon_settings['excluded_brands'] );
	if ( ! $brand_restrictions ) {
		return $valid;
	}

	$included_brands_match   = false;
	$excluded_brands_matches = 0;

	$items = $discounts->get_items();

	foreach ( $items as $item ) {
		$product_brands = $this->get_product_brands( $this->get_product_id( $item->product ) );

		if ( ! empty( array_intersect( $product_brands, $brand_coupon_settings['included_brands'] ) ) ) {
			$included_brands_match = true;
		}

		if ( ! empty( array_intersect( $product_brands, $brand_coupon_settings['excluded_brands'] ) ) ) {
			++$excluded_brands_matches;
		}
	}

	// 1) Coupon has a brand requirement but no products in the cart have the brand.
	if ( ! $included_brands_match && ! empty( $brand_coupon_settings['included_brands'] ) ) {
		throw new Exception( $coupon->get_coupon_error( WC_Coupon::E_WC_COUPON_NOT_APPLICABLE ), WC_Coupon::E_WC_COUPON_NOT_APPLICABLE ); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
	}

	// 2) All products in the cart match brand exclusion rule.
	if ( count( $items ) === $excluded_brands_matches ) {
		throw new Exception( __( 'Sorry, this coupon is not applicable to the brands of selected products.', 'woocommerce' ), self::E_WC_COUPON_EXCLUDED_BRANDS ); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
	}

	// 3) For a cart discount, there is at least one product in cart that matches exclusion rule.
	if ( $coupon->is_type( 'fixed_cart' ) && $excluded_brands_matches > 0 ) {
		throw new Exception( __( 'Sorry, this coupon is not applicable to the brands of selected products.', 'woocommerce' ), self::E_WC_COUPON_EXCLUDED_BRANDS ); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped
	}

	return $valid;
}