php – 为什么在文档/文字样式中使用WSDL的SoapClient返回带有额外键元素的数组？

我们正在将RPC /编码的web服务转换为document / literal / wrapped.
WSDL(使用nusoap)已经被重写以使用新格式.

我像这样使用PHP SoapClient：

new SoapClient($wsdlUrl,array(
    'cache_wsdl' => WSDL_CACHE_NONE,'trace' => true,'features' => SOAP_SINGLE_ELEMENT_ARRAYS,));

相关的WSDL部分如下所示(应该遵循WS-I Basic Profile)：

<xsd:complexType name="messages">
<xsd:sequence>
<xsd:element name="item" type="xsd:string" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>

<xsd:complexType name="some_functionResponseType">
<xsd:all>
<xsd:element name="return" type="tns:messages" form="unqualified"/>
</xsd:all>
</xsd:complexType>

<message name="some_functionResponse">
<part name="parameters" element="tns:some_functionResponseType"/>
</message>

<operation name="some_function">
<input message="tns:some_functionRequest"/>
<output message="tns:some_functionResponse"/>
</operation>

当我提交请求时,XML响应是这样的：

<?xml version="1.0" encoding="utf-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/">
  <SOAP-ENV:Body>
    <some_functionResponse xmlns="urn:toets_nl_wsdl">
      <messages xmlns="">
        <item>foo</item>
        <item>bar</item>
      </messages>
    </some_functionResponse>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

当我在PHP中转储结果对象时,它看起来像这样：

stdClass Object
(
    [messages] => stdClass Object
        (
            [item] => Array             // <-- here
                (
                    [0] => foo
                    [1] => bar
                )

        )

)

为什么结果树中有一个额外的元素“item”？当我们仍在使用RPC / encoded时,这不存在.

有没有办法在处理响应时删除该元素？