如何获取SoapClient最后响应Soap标头

Question

我使用本地SoapClient类发出请求。

如何从响应中获取Soap标头？

例如，响应为：

<soap-env:Envelope
xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
<soap-env:Header>
    <eb:MessageHeader xmlns:eb="http://www.ebxml.org/namespaces/messageHeader" eb:version="1.0" soap-env:mustUnderstand="1">
    </eb:MessageHeader>
    <wsse:Security
        xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext">
        <wsse:BinarySecurityToken valueType="String" EncodingType="wsse:Base64Binary">security token text</wsse:BinarySecurityToken>
    </wsse:Security>
</soap-env:Header>
<soap-env:Body>
    <SessionCreateRS
        xmlns="http://www.opentravel.org/OTA/2002/11" version="1" status="Approved">
        <ConversationId></ConversationId>
    </SessionCreateRS>
</soap-env:Body>

如何在页眉块中获取wsse:BinarySecurityToken标签的内容？

除了通过SoapClient::__getLastResponse()检索原始XML并进行解析之外，还有什么明确的方法吗？