Do you want to apply a BOGO ‘buy one get one’ offer for variable products in the WooCommerce cart page based on the product IDs? Here is the solution for you.
add_action('woocommerce_cart_calculate_fees', 'ts_add_custom_discount_2nd_at_50', 10, 1 );
function ts_add_custom_discount_2nd_at_50( $wc_cart ){
if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
$discount = 0;
$items_prices = array();
// Set here your targeted variable product ID
$targeted_product_id = 15;
foreach ( $wc_cart->get_cart() as $key => $cart_item ) {
if( $cart_item['product_id'] == $targeted_product_id ){
$qty = intval( $cart_item['quantity'] );
for( $i = 0; $i < $qty; $i++ )
$items_prices[] = floatval( $cart_item['data']->get_price());
}
}
$count_items_prices = count($items_prices);
if( $count_items_prices > 1 ) foreach( $items_prices as $key => $price )
if( $key % 2 == 1 ) $discount -= number_format($price / 2, 2 );
if( $discount != 0 ){
// Displaying a custom notice (optional)
wc_clear_notices();
wc_add_notice( __("You get 50% of discount on the 2nd item"), 'notice');
// The discount
$wc_cart->add_fee( 'Discount 2nd at 50%', $discount, true );
}
}
Output
When the customer adds two quantities of Hoodie-Red items to the WooCommerce cart page, the discount applies to the second item as shown below.
Similarly, you can also implement buy 2 get 50% off on second item in WooCommerce cart page.
