PHP - 如何通过SoapClient发送HTML

Question

每次使用SoapClient发送html字符串时，都会出现以下错误：

Uncaught SoapFault exception: [a:DeserializationFailed] 
The formatter threw an exception while trying to deserialize the message:
There was an error while trying to deserialize parameter ...

示例：

$productData = [
    'id' => 123,
    'name' => 'ProdName',
    'description' => 'This product is just <b>AMAZING!</b>'
];

$ws = new \SoapClient(...);
$ws->ProductUpdate($productData);

那么，我怎么能通过它发送html数据？