WooCommerce additional fees based on purchased quantity for specific products

Question

Here is the code I currently have:

add_action('woocommerce_cart_calculate_fees' , 'add_custom_fees');
function add_custom_fees( $cart ){

    if (is_admin() && !defined('DOING_AJAX')) {
        return;
    }

    $pizza_ice = 0;
    $pizza_materials = 0;
    $gravy_ice = 0;
    $gravy_materials = 0;

    $pizza_burger = 293;
    $gravy = 462;
    
    $pizza_in_cart = false;
    $gravy_in_cart = false;

    foreach( $cart->get_cart() as $item ){
        $product_in_cart = $item['product_id'];
        if ( $product_in_cart === $pizza_burger) {
            $pizza_in_cart = true;
        }
        elseif ( $product_in_cart === $gravy) {
            $gravy_in_cart = true;
        }
    }

    if ( $pizza_in_cart != false ) {
        $pizza_ice += $item['quantity'] * 27;
        $pizza_materials += $item['quantity'] * 9.99;

        $cart->add_fee( 'Dry Ice - Pizza Burger', $pizza_ice);
        $cart->add_fee( 'Shipping Materials - Pizza Burger', $pizza_materials);
    }
    elseif ( $gravy_in_cart != false ) {
        $gravy_ice += $item['quantity'] * 27;
        $gravy_materials += $item['quantity'] * 6.99;

        $cart->add_fee( 'Dry Ice - Frozen Gravy', $gravy_ice);
        $cart->add_fee( 'Shipping Materials - Frozen Gravy', $gravy_materials);
    }
    elseif ( $pizza_in_cart != false || $gravy_in_cart != false ) {
        $pizza_ice += $item['quantity'] * 27;
        $pizza_materials += $item['quantity'] * 9.99;

        $cart->add_fee( 'Dry Ice - Pizza Burger', $pizza_ice);
        $cart->add_fee( 'Shipping Materials - Pizza Burger', $pizza_materials);

        $gravy_ice += $item['quantity'] * 27;
        $gravy_materials += $item['quantity'] * 6.99;

        $cart->add_fee( 'Dry Ice - Frozen Gravy', $gravy_ice);
        $cart->add_fee( 'Shipping Materials - Frozen Gravy', $gravy_materials);
    }

}

What I am trying to do is:

If Pizza Burger product is in the cart, it should add the Dry Ice fee AND Materials fee for each quantity.
If Frozen Gravy product is in the cart, it should add the Dry Ice fee AND Materials fee for each quantity.
If both Pizza Burger and Frozen Gravy products are in the cart, it should add BOTH Dry Ice fees AND BOTH Materials fees for each quantity.

What am I doing wrong here?

When this snippet is active, It's only working for the Gravy. Changing the quantity for Pizza Burgers has no effect on the new fees.

LoicTheAztec LoicTheAztec · Accepted Answer · 2021-02-11T22:15:07

There are some mistakes in your code, try the following instead:

add_action('woocommerce_cart_calculate_fees' , 'add_custom_fees');
function add_custom_fees( $cart ){
    if (is_admin() && !defined('DOING_AJAX')) 
        return;

    ## -- product Ids -- ##    
    $pizza_id = 293;
    $gravy_id = 462;
    
    ## -- dry Ice & Materials fee amounts -- ##  
    $pizza_ice = $gravy_ice = 27;
    $pizza_mat = 9.99;
    $gravy_mat = 6.99;

    $gravy_qty = $pizza_qty = 0; // Initializing

    // Loop through cart items
    foreach( $cart->get_cart() as $item ){
        if ( $item['product_id'] == $pizza_id ) {
            $pizza_qty += $item['quantity'];
        } 
        elseif ( $item['product_id'] == $gravy_id ) {
            $gravy_qty += $item['quantity'];
        }
    }

    if ( $pizza_qty > 0 ) {
        $cart->add_fee( 'Dry Ice - Pizza Burger', $pizza_qty * $pizza_ice );
        $cart->add_fee( 'Shipping Materials - Pizza Burger', $pizza_qty * $pizza_mat );
    }

    if ( $gravy_qty > 0 ) {
        $cart->add_fee( 'Dry Ice - Frozen Gravy', $gravy_qty * $gravy_ice );
        $cart->add_fee( 'Shipping Materials - Frozen Gravy', $gravy_qty * $gravy_mat );
    }
}

Code goes in functions.php file of the active child theme (or active theme). It should works.

WooCommerce additional fees based on purchased quantity for specific products

1 Answers