Woocommerce - Discount a value for quantity products in your cart (No Plugin )

 //Discount a value for quantity products in your cart

function woo_add_cart_fee() {
global $woocommerce;

//Discount for quantity
$quantity_products = $woocommerce->cart->get_cart_contents_count();
$discount_value = ($quantity_products – 1) * 5;

$woocommerce->cart->add_fee( __(‘Discount for quantity’, ‘woocommerce’), -$valor_a_descontar );
}
add_action( ‘woocommerce_cart_calculate_fees’, ‘woo_add_cart_fee’ );