Add extra charge on shipping rate for each KG weight on cart

Add extra charge on shipping rate for each KG weight on cart.php

<?php
/**
 * Add extra charge on shipping rate for each KG weight on cart
 */

add_filter( 'woocommerce_package_rates', 'custom_delivery_flat_rate_cost_calculation', 10, 2 );
function custom_delivery_flat_rate_cost_calculation( $rates, $package )
{
    // The total cart items  weight
    $cart_weight = WC()->cart->get_cart_contents_weight();

    foreach($rates as $rate_key => $rate_values){
        $method_id = $rate_values->method_id;
        $rate_id = $rate_values->id;
        if ( 'wbs' === $method_id && $cart_weight > 500) { // Se lo slug di spedizione è uguale a, e il peso è maggiore di 500
            ##  SHIPPING COSTS AND TAXES CALCULATIONS ##
	for( $i = 500; $i < $cart_weight; $i += 1 ){
            $rates[$rate_id]->cost += 0.40;
	}
            
        }
	    return $rates;
    }
}