如何一次收费多个项目在条纹?

我正试图找到一种方法,让条纹一次收费多个项目。我想应该是这样的:

$totalitems = [];
if ( $item1 == "true" ) {
    $currentitem = array(
    "amount" => 19999,
    "currency" => "usd",
    "description" => "Item 1",
    "customer" => $customer->id,
    );
    array_push($totalitems, $currentitem);
}

if ( $item2 == "true" ) {
    $currentitem = array(
    "amount" => 29999,
    "currency" => "usd",
    "description" => "Item 2",
    "customer" => $customer->id,
    );
    array_push($totalitems, $currentitem);
}

$charge = \Stripe\Charge::create([$totalitems]);

这只对数组中的第一项收费。有一种方法可以同时收取多个项目的费用吗?