使用wordpress将key => value添加到function.php中的购物车数组

Question

我已经使用ajax调用计算了两个位置之间的距离。我想在function.php中的购物车数组中添加[“ distance”] =>“ 0km”。

我试图设置自定义字段来保存距离，但是它不起作用。

function custom_func_ajax_request() {
    $addressFrom    = isset($_POST['origin'])?trim($_POST['origin']):"";
    $addressTo   = isset($_POST['dest'])?trim($_POST['dest']):"";

    // Get distance in km
    $distance = getDistance($addressFrom, $addressTo, "K");
    add_action( 'woocommerce_cart_calculate_fees', 'woo_add_cart_fee',$distance );

    $response   = array();
    $response['message']    = "Successfull Request";
    $response['distance']  =$distance;
    echo json_encode($response);
    exit;
  }

function woo_add_cart_fee($distance) {

  global $woocommerce;

  $woocommerce->cart->add_fee( __('distance', 'woocommerce'), $distance );

}

我想在计算距离后将“距离”键及其值包括在购物车数组中。这是小的输出代码段。

  ["e12cb8b57b281ffd5b60a606e616e424"]=>
  array(12) {
    ["key"]=>
    string(32) "e12cb8b57b281ffd5b60a606e616e424"
    ["product_id"]=>
    int(4237)
    ["variation_id"]=>
    int(4241)
    ["variation"]=>
    array(2) {
      ["attribute_quantity"]=>
      string(5) "500ml"
      ["attribute_package"]=>
      string(9) "Glass Jar"
    }
    ["quantity"]=>
    int(1)
    ["distance"]=>"2.4km" //Calculated from ajaxcall
}