Check if Coupon is Applied

In this tutorial I am going to cover different ways how you can check if a specific (or any) coupon has previously been added to WooCommerce cart or to a specific order.

In Cart

We can check quite easily if a coupon has been applied to cart using WC()->cart->get_applied_coupons() method that returns an array of all coupon codes like Array( 0 => blackfrd, 1 => nysale). So it is super simple to check if there is a specific coupon in that array, just use in_array() PHP function.

if( in_array( 'blackfrd', WC()->cart->get_applied_coupons() ) ) {
	// Coupon "blackfrd" is added to cart
}

The same using WC()->cart->has_discount() method. I think it is more correct and clear to be honest.

if( WC()->cart->has_discount( 'blackfrd' ) ) {
	// Coupon "blackfrd" is added to cart
}

By using WC()->cart->get_applied_coupons() we can also check if ANY coupon has been added to cart.

if( count( WC()->cart->get_applied_coupons() ) > 0 ) {
	// There are coupons
}

In Specific Order

Sometimes you may want to check if a coupon has been applied to a specific order in WooCommerce.

We have plenty of things to check here!

First of all let’s try $order->get_coupon_codes() method which is similar to WC()->cart->get_applied_coupons() we used above.

$order = wc_get_order( $order_id );

if( in_array( 'blackfrd', $order->get_coupon_codes() ) ) {
	// Coupon "blackfrd" is added to an order
}

Let’s also check if ANY coupon has been added to the order.

if( count( $order->get_coupon_codes() ) > 0 ) {
	// There are coupons
}

We can also find out what was the discount amount using either $order->get_discount_total() or $order->get_total_discount(), the second one allows to calculate tax discount as well plus it has woocommerce_order_get_total_discount filter hook inside.

echo 'Your discount: ' . $order->get_discount_total();
// Your discount: 200

It is also possible to check if order items specifically have discounts. In order to do that we are going to use get_items() method of WC_Order object, and get_subtotal() and get_total() methods of WC_Order_Item object.

foreach( $order->get_items() as $item ) {
	echo 'Discount: ' . ( $item->get_subtotal() - $item->get_total() );		
}

# WooCommerce, Coupons

Misha Rudrastyh

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