我这样计算我的统一运费：x*[qty]

我还想将此方法用于我的本地拾取方法，但是使用如上所示的函数，不起作用。

如何根据物料数量计算运输成本？

WordPress： 4.8.4/WooCommerce： 3.1.1

页面链接：http://www.minimoto.me/

更新：

在第一个有用的答案之后，这是我使用的代码：

add_filter( 'woocommerce_package_rates', 'hide_shipping_method_based_on_shipping_class', 10, 2 );
function hide_shipping_method_based_on_shipping_class( $rates, $package )
{
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    ##  -----  1. Hiding shipping methods based on shipping class 92  -----  ##

    // HERE define your shipping class to find
    $class = 92;

    // HERE define the shipping methods you want to hide
    $method_key_ids = array('local_pickup:8');

    // Checking in cart items
    foreach( WC()->cart->get_cart() as $cart_item ){
        // If we find the shipping class
        if( $cart_item['data']->get_shipping_class_id() == $class ){
            foreach( $method_key_ids as $method_key_id ){
                unset($rates[$method_key_id]); // Remove the targeted methods
            }
            break; // Stop the loop
        }
    }

    ##  ----- 2. Hiding shipping methods based on shipping class 132  -----  ##

    // HERE define your shipping class to find
    $class = 132;

    // HERE define the shipping methods you want to hide
    $method_key_ids = array('local_pickup:2', 'local_pickup:3', 'local_pickup:4');

    // Checking in cart items
    foreach( WC()->cart->get_cart() as $cart_item ){
        // If we find the shipping class
        if( $cart_item['data']->get_shipping_class_id() == $class ){
            foreach( $method_key_ids as $method_key_id ){
                unset($rates[$method_key_id]); // Remove the targeted methods
            }
            break; // Stop the loop
        }
    }

    ##  -------  3. Charge local pickup costs per item quantity  -------  ##

    $cart_items_count = WC()->cart->get_cart_contents_count(); // Cart items count

    // Iterating through Shipping Methods
    foreach ( $rates as $rate_key => $rate ) {
        $method_id = $rate_values->method_id;
        $rate_id = $rate_values->id;

        // For "Local pickup" Shipping" Method only
        if ( 'local_pickup' === $method_id ) {
            if( ! empty( $rates[$rate_id]->cost && $rates[$rate_id]->cost > 0 ) ) {
                // Set the rate calculated cost based on cart items count
                $rates[$rate_id]->cost = number_format($rates[$rate_id]->cost * $cart_items_count, 2);
                // Taxes rate cost (if enabled)
                foreach ($rates[$rate_id]->taxes as $key => $tax){
                    if( $rates[$rate_id]->taxes[$key] > 0 ){ // set the new tax cost
                        $taxes[$key] = number_format( $rates[$rate_id]->taxes[$key] * $cart_items_count, 2 );
                        $has_taxes = true;
                    } else {
                        $has_taxes = false;
                    }
                }
                if( $has_taxes )
                    $rates[$rate_id]->taxes = $taxes;
            }
        }
    }

    return $rates;
}