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I have created a code in WooCommerce Coupon Codes called "2FOR1WOW" and added this code to functions.php but it's not working. The ticket gets applied and a confirmation message says it's ok but the total is not reduced.

Any help would be greatly appreciated!

// Hook before calculate fees - "Buy 2 get cheapest free" coupon
add_action('woocommerce_cart_calculate_fees' , 'buy2_coupon');

/**
 * Add discount for "Buy 2 get cheapest free" coupon
 * @param WC_Cart $cart
 */

function buy2_coupon( WC_Cart $cart ){

    // add the coupons here
    $buy2_coupons = array('2FOR1WOW', 'anothercouponcode');

    // return if cart has less than 2 items
    if( $cart->cart_contents_count < 2 ){
        return;
    }

    $applied_coupons = $cart->get_applied_coupons();    
    $matches = array_intersect($buy2_coupons, $applied_coupons);

    // return if no coupon matches
    if (empty($matches)) return;

    // loop through the items in cart to find the cheapest
    foreach ( $cart->get_cart() as $cart_item_key => $values ) {
        $_product = $values['data'];
        $product_price[] = $_product->get_price_including_tax();
    }

    $cheapest = min($product_price);

    $cart->add_fee( 'Coupon 2FOR1WOW', -$cheapest, true, 'standard' );
}
LoicTheAztec
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Melkiades
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1 Answers1

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Since WooCommerce 3+, the WC_Product get_price_including_tax() is deprecated and has been replaced by the function wc_get_price_excluding_tax() (not anymore a method).

You should not need any coupon code to make this kind of code working. As you are using them to fired this discount "Buy one Get one Free", I keep it on the function below.

What you have forgotten in your code is:

  • to take care of quantities, when you are adding the product prices in your prices array.
  • to get all necessary cheapest prices array, when there is multiple items, with different quantities.

The min() php function will work only on one item, so it's not really appropriated.

So the correct code should be something like:

add_action('woocommerce_cart_calculate_fees', 'buy_one_get_one_free', 10, 1 );
function buy_one_get_one_free( $wc_cart ){
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;

    $cart_item_count = $wc_cart->get_cart_contents_count();
    if ( $cart_item_count < 2 ) return;

    // Set HERE your coupon codes
    $coupons_codes = array('2for1wow', 'anothercouponcode');
    $discount = 0; // initializing

    $matches = array_intersect( $coupons_codes, $wc_cart->get_applied_coupons() );
    if( count($matches) == 0 ) return;

    // Iterating through cart items
    foreach ( $wc_cart->get_cart() as $key => $cart_item ) {
        $qty = intval( $cart_item['quantity'] );
        // Iterating through item quantities
        for( $i = 0; $i < $qty; $i++ )
            $items_prices[] = floatval( wc_get_price_excluding_tax( $cart_item['data'] ) );
    }
    asort($items_prices); // Sorting cheapest prices first

    // Get the number of free items (detecting odd or even number of prices)
    if( $cart_item_count % 2 == 0 ) $free_item_count = $cart_item_count / 2;
    else  $free_item_count = ($cart_item_count - 1) / 2;

    // keeping only the cheapest free items prices in the array
    $free_item_prices = array_slice($items_prices, 0, $free_item_count);

    // summing prices for this free items
    foreach( $free_item_prices as $key => $item_price )
        $discount -= $item_price;

    if( $discount != 0 ){
        // The discount
        $label = '"'.reset($matches).'" '.__("discount");
        $wc_cart->add_fee( $label, number_format( $discount, 2 ), true, 'standard' );
        # Note: Last argument in add_fee() method is related to applying the tax or not to the discount (true or false)
    }
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

This code is tested on Woocommerce 3+ and works. You will get something like:

enter image description here

A coupon code (here 2for1wow) need to be created with a zero price discount. When the coupon is applied to cart, a negative fee (a discount) is enabled and will free one item on two.

Similar answer: WooCommerce discount: buy one get one 50% off

LoicTheAztec
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  • Thank you LoicTheAztec! But it's not working :) I've upgraded to the latest versions of WP and Woo, thinking it was maybe the problem, to no avail. The same thing happens: nothing is calculated. You can see it in action here (even though it's in French): https://boutique.maison4tiers.com/ You just have to add 2 DVD's at least to test it. DVD's are marked as such. Not sure why all products are labeled in red since the upgrade though. p.s.: How do we add end of line to comments in here? – Melkiades Nov 06 '17 at 02:07
  • Hi Loic, about your note that I don't need a coupon code: in this case yes, because I want only clients with the coupon code to benefit from this promo. – Melkiades Nov 06 '17 at 02:41
  • this is what I get when reaching your page --> https://www.screencast.com/t/Otechua5B – Melkiades Nov 07 '17 at 17:52
  • same for me, nothing applies. it should work without manually creating a coupon, correct? –  Oct 09 '18 at 18:35