如何为SOAP调用创建PHP数组

下面是SOAP函数:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:v2="http://domain.com/" xmlns:sen="http:/domain.com">
   <soapenv:Header/>
   <soapenv:Body>
      <v2:actionContactsGroup>
         <sen:pInfo>
            <sen:ActionType>?</sen:ActionType>
            <sen:GroupName>?</sen:GroupName>
            <!--Optional:-->
            <sen:ContactIdsList>
               <!--1 or more repetitions:-->
               <sen:Id>?</sen:Id>
            </sen:ContactIdsList>
         </sen:pInfo>
      </v2:actionContactsGroup>
   </soapenv:Body>
</soapenv:Envelope>

如果我发送这个XML代码，它就可以工作了:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:v2="http://domain.com" xmlns:sen="http://domain.com">
   <soapenv:Header/>
   <soapenv:Body>
      <v2:actionContactsGroup>
         <sen:pInfo>
            <sen:ActionType>Add</sen:ActionType>
            <sen:GroupName>MyGroup</sen:GroupName>
            <sen:ContactIdsList>
               <sen:Id>SomeID1</sen:Id>
               <sen:Id>SomeID2</sen:Id>
               <sen:Id>SomeID3</sen:Id>
            </sen:ContactIdsList>
         </sen:pInfo>
      </v2:actionContactsGroup>
   </soapenv:Body>
</soapenv:Envelope>

但是我无法在php中做同样的事情。我可以一次只处理一个id:

$addToGroup = array(
            'pInfo'=>array(
                'ActionType'=>'Add',
                'GroupName'=>'MyGroup',
                'ContactIdsList'=>array('Id'=>'SomeID1')
            )
        );

但如果我尝试多个id它不工作，无论我如何格式化数组。想法吗?

我试过了，但是没有成功:

// didnt work, came back saying "Warning: Contact not found
// [Array]WarningDuplicated contact. Only first instance was used."
$addToGroup = array(
        'pInfo'=>array(
            'ActionType'=>'Add',
            'GroupName'=>'NCAL_SUW',
            'ContactIdsList'=>array(
                array('Id'=>'SomeID1'),
                array('Id'=>'SomeID2')
            )
        )
    )