PHP SOAP 服务器存储参数

我目前正在尝试使用以下代码设置SOAP服务器。

服务器.php

<?php
class Name {
    private $_name;
    public function setName($name) {
        $this->_name = $name;
    }
    public function getName() {
        return $this->_name;
    }
}
$server = new SoapServer('soap.wsdl');
$server->setClass('Name');
$server->handle();
?>

客户端.php

<?php
$client = new SoapClient('soap.wsdl');
$client->setName('test');
print $client->getName();
?>

soap.wsdl

<?xml version ="1.0" encoding ="UTF-8" ?>
<definitions
    name="Name"
    targetNamespace="/Name/"
    xmlns="http://schemas.xmlsoap.org/wsdl/"
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
    xmlns:tns="http://www.examples.com/wsdl/HelloService.wsdl"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <message name="nameInput">
        <part name="sName" type="xsd:string" />
    </message>
    <message name="nameOutput">
        <part name="sName" type="xsd:string" />
    </message>
    <portType name="NamePortType">
        <operation name="setName" parameterOrder="sName">
            <input message="tns:nameInput" />
        </operation>
        <operation name="getName">
            <output message="tns:nameOutput" />
        </operation>
    </portType>
    <binding name="NameBinding" type="tns:NamePortType">
        <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
        <operation name="setName">
            <soap:operation soapAction=""/>
            <input>
                <soap:body use="literal"/>
            </input>
        </operation>
        <operation name="getName">
            <soap:operation soapAction=""/>
            <output>
                <soap:body use="literal"/>
            </output>
        </operation>
    </binding>
    <service name="NameService">
        <port name="NamePort" binding="tns:NameBinding">
            <soap:address location="http://10.200.3.48/zI/soap/server.php"/>
        </port>
    </service>
</definitions>

是否可以在类对象的参数中存储值？getName（） 返回一个空字符串。