WP cart form. send product cookie

function cart_form(){
  $multiple_recipients = array(
    get_option('admin_email')
  );
  $message = '';
  $message .= "Имя: ".$_POST['u-name']."\n\r";
  $message .= 'Телефон: '.$_POST['u-telephone']."\n\r";
  $message .= "Удобное время: ".$_POST['u-time']."\n\r";
  $message .= "Город: ".$_POST['u-city']."\n\r";
  $message .= "Email: ".$_POST['u-mail']."\n\r";
  $cartProducts = json_decode(str_replace("\\", "", $_COOKIE['cart_products']));
  if($cartProducts) {
    $sum = 0;
    foreach ($cartProducts as $product) {
      $price = get_post_meta($product->id, 'price', true);
      $sum += $price*$product->numb;
      $message .= "\n\r";
      $message .= "\nНаименование товара: ".get_the_title($product->id);
      $message .= "\nID товара: ".$product->id;
      $message .= "\nКоличество товара: ".$product->numb;
    }
  }

  // if(wp_mail( get_option('admin_email'), $_POST['u-theme'], $message)){
  if(wp_mail( $multiple_recipients, $_POST['u-theme'], $message)){
      die('true');
    }
  exit();
}

// Содержимое куки:
// Name cart_products
// Value    {"2140":{"id":2140,"numb":1}}