如何在wordpress中修改结帐总额

Question

如何修改结帐总额。添加了我的自定义费率，此费率在动态wordpress hook

上生成

add_filter('woocommerce_package_rates','test_overwrite_fedex',100,2);
function test_overwrite_fedex($rates,$package) {

foreach ($rates as $rate) {
    var_dump($rates);die();
    //Set the price
    $rate->cost = 1000;

    //Set the TAX
    $rate->taxes[1] = 1000 * 0.2;

}

return $rates;
}