根据供应商和客户城市设置不同的运输

Question

我有一家在woocommerce中有多个供应商和客户的商店，我想根据不同城市添加不同的运费。例如，现在我有三个城市，所以我可以按条件处理运费，但是现在我需要再增加7个城市，以便如何使用条件处理

下面是我现在用来处理两个城市的代码，但是当我再添加7个城市时如何处理运输。

add_filter( 'woocommerce_package_rates', 'distance_shipping_calculated_surcharge', 100, 2 );
function distance_shipping_calculated_surcharge( $rates, $package ) {
    global $woocommerce;

    ## HERE set your API code to get the distance ##
    $items = $woocommerce->cart->get_cart();

    $_product = array();
    foreach($items as $item => $values) {
    $_product[] = $values['data']->post;
    // print_r($_product);
    }
    $product_in_cart_vendor_id = get_post_field( 'post_author', $_product[0]->ID);
    //$product_added_vendor_id = get_post_field( 'post_author', $prodId );
    //echo "product vendor id: ".$product_in_cart_vendor_id;

    $vendor_detail = get_user_meta ($product_in_cart_vendor_id);
    $vendor_city = ucfirst($vendor_detail ['_vendor_city'][0]);
    // $user_id = get_current_user_id();
    // $user_detail = get_user_meta($user_id);
    //$user_city = $user_detail ['_billing_city'][0];
    session_start();
    //echo '<pre>' . print_r($_SESSION['city'], TRUE) . '</pre>';
    if($_SESSION['city']){
        $user_city = $_SESSION['city'];
        //echo $user_city;

    } 
    elseif(isset($_POST['billing_city'])){
        $user_city = $_POST['billing_city'];
    }
    else{
        $user_id = get_current_user_id();
        $user_detail = get_user_meta($user_id);
        $user_city = $user_detail ['billing_city'][0];
        //echo $user_city;
    }


    // Distance example
    //$distance = 2; //(in KM)

    if( $vendor_city == 'A' && $user_city == 'B'){
        $cost_operator = 50; // (3 * 50 = 150)
    }
    elseif( $vendor_city == 'B' && $user_city == 'A'){
        $cost_operator = 50; 
    }
    elseif( $vendor_city == 'B' || $vendor_city == 'A' && $user_city == ''){
        $cost_operator = 30;
    }
    else{
        $cost_operator = 30; 
    }

    // Iterating through each shipping rate
    foreach($rates as $rate_key => $rate_values){
        $method_id = $rate_values->method_id;
        $rate_id = $rate_values->id;
        // if ( __( 'Local pickup', 'woocommerce' ) == $rate->label ){
        //     $rates[$rate_key]->label = __( 'Pick Up From Store', 'woocommerce' ); 
        // }
        //echo $rate_id;exit;
        // Targeting "Flat Rate" shipping method
        if ( 'flat_rate' === $rate_values->method_id ) {
            // Set the new calculated rate cost
            $rates[$rate_id]->cost = number_format($cost_operator, 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
                    $rates[$rate_id]->taxes[$key] = number_format($cost_operator, 2 );
                }
            }
        }
    }
    return $rates;
    session_destroy();
    // print_r($rates);
    // exit;

}

谢谢