Add fee based on product category and shipping method WooCommerce

Question

I'm trying to add a fee of £3 per product if any of the products in the basket have the category ID "160".

This is working great but I also only want this fee to apply if certain shipping methods are chosen.

What I have so far:

function df_add_ticket_surcharge( $cart_object ) {

    global $woocommerce;
    $specialfeecat = 160; // category id for the special fee
    $spfee = 3.00; // initialize special fee
    $spfeeperprod = 3.00; //special fee per product

    foreach ( $cart_object->cart_contents as $key => $value ) {

        $proid = $value['product_id']; //get the product id from cart
        $quantiy = $value['quantity']; //get quantity from cart
        $itmprice = $value['data']->price; //get product price

        $terms = get_the_terms( $proid, 'product_cat' ); //get taxonamy of the prducts
        if ( $terms && ! is_wp_error( $terms ) ) :
            foreach ( $terms as $term ) {

                $catid = $term->term_id;

                if($specialfeecat == $catid ) {
                    $spfee = $spfee * $quantiy;
                }
            }
        endif;  
    }

    if($spfee > 0 ) {
        $woocommerce->cart->add_fee( 'Ticket Concierge Charge', $spfee, true, 'standard' );
    }

}

add_action( 'woocommerce_cart_calculate_fees', 'df_add_ticket_surcharge' );

I have tried integrating the function from this post: https://stackoverflow.com/a/47732732/12019310 but can't seem to get it functioning without a critical notice.

Any advice would be greatly appreciated!

Answer 1

The following code

• add A fee of 3 per product in the basket if it belongs to the category ID "160"
• If "local_pickup" is chosen

function df_add_ticket_surcharge( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $chosen_shipping_method_id = WC()->session->get( 'chosen_shipping_methods' )[0];
    $chosen_shipping_method    = explode(':', $chosen_shipping_method_id)[0];

    /* SETTINGS */

    $special_fee_cat = 160; // category id for the special fee
    $fee_per_prod = 3; //special fee per product

    /* END SETTINGS */      

    // Total
    $total = 0;

    // Only for Local pickup chosen shipping method
    if ( strpos( $chosen_shipping_method_id, 'local_pickup' ) !== false ) {
        // Loop though each cart items and set prices in an array
        foreach ( $cart->get_cart() as $cart_item ) {
            // Get product id
            $product_id = $cart_item['product_id'];

            // Quantity
            $product_quantity = $cart_item['quantity'];

            // Check for category
            if ( has_term( $special_fee_cat, 'product_cat', $product_id ) ) {
                $total += $fee_per_prod * $product_quantity;
            }
        }

        // Add the discount
        $cart->add_fee( __('Ticket Concierge Charge', 'woocommerce'), $total );
    }
}
add_action( 'woocommerce_cart_calculate_fees', 'df_add_ticket_surcharge', 10, 1 );