Users can manually enter a coupon code, refresh the Cart and see their discount apply… or you can do that automatically (or “programmatically” as we say in the dark web) when a user adds a product to the WooCommerce Cart 🙂
All you’ve got to do is creating a coupon, and then a PHP function will do the whole work. Automation is the best thing in the world!
WooCommerce: how to add a coupon programmatically if a product is added to cart
PHP Snippet 1: Apply a Coupon Programmatically if a Product is in the Cart
Notes:
Create a coupon code that you want to apply once a certain product is added to cart (go to WooCommerce / Coupons / Add New and decide your coupon code. For example “freeweek”, which is the coupon code we will use later in the PHP snippet)
Identify your product ID (go to WordPress / Products and hover onto the product you want to use the coupon with. Whatever ID shows in the URL bar, take a note. In our example, we will target product ID = “745”)
/**
* @snippet Apply a Coupon Programmatically if Product @ Cart - WooCommerce
* @how-to Get tutoraspire.com FREE
* @author Tutor Aspire
* @compatible WC 4.1
* @donate $9 https://tutoraspire.com
*/
add_action( 'woocommerce_before_cart', 'tutoraspire_apply_matched_coupons' );
function tutoraspire_apply_matched_coupons() {
$coupon_code = 'freeweek';
if ( WC()->cart->has_discount( $coupon_code ) ) return;
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
// this is your product ID
$autocoupon = array( 745 );
if ( in_array( $cart_item['product_id'], $autocoupon ) ) {
WC()->cart->apply_coupon( $coupon_code );
wc_print_notices();
}
}
}
PHP Snippet 2: Apply a Coupon Programmatically for ALL Products
/**
* @snippet How to Apply a Coupon Programmatically - WooCommerce Cart
* @how-to Get tutoraspire.com FREE
* @author Tutor Aspire
* @compatible WC 4.1
* @donate $9 https://tutoraspire.com
*/
add_action( 'woocommerce_before_cart', 'tutoraspire_apply_coupon' );
function tutoraspire_apply_coupon() {
$coupon_code = 'freeweek';
if ( WC()->cart->has_discount( $coupon_code ) ) return;
WC()->cart->apply_coupon( $coupon_code );
wc_print_notices();
}
