PHP web服务客户端调用JAVA web服务服务器

请提供帮助。

这是文档服务http://ebizonline.allianzcp.com/online_insurance_test/IssuePolicySoapHttpPort?WSDL

我需要使用PHP来调用操作"OnlineMainWS"并发送参数（"METHOD"="VERIFY"）。它不是所有的参数请求。但会返回类似的错误代码

CODE= 001
CMI_URL_PRINT= null
VMI_URL_PRINT= null
CMI_POLICY_NO= null
VMI_POLICY_NO= null
METHOD = VERIFY

我的问题是无法将参数发送到web服务。我需要示例代码来调用和发送参数。并且返回CODE不会为空。请帮帮我-/-

这是我的代码

class RequestModel {
    function RequestModel($METHOD) 
    {
        $this->METHOD = $METHOD;
    }
}
$soapclient = new SoapClient(
    'http://ebizonline.allianzcp.com/online_insurance_test/IssuePolicySoapHttpPort?wsdl',
    array(
        'location' => 'http://ebizonline.allianzcp.com/online_insurance_test/IssuePolicySoapHttpPort',
        'uri' => 'http://azcp.online.ws/',
        'trace' => 1,
        'use' => SOAP_LITERAL,
        'style' => SOAP_RPC,
        "soap_version" => SOAP_1_1
    )
);
/* Fill your Contact Object */
$RequestModel = new RequestModel("VERIFY");
/* Set your parameters for the request */
$params = array(
  "requestModel" => $RequestModel
);
$result = $soapclient->__soapCall('OnlineMainWS', $params,  array('soapaction' => 'http://azcp.online.ws//OnlineMainWS') );
var_dump($result);
echo "<br><br><br> ====== REQUEST HEADERS ===== <br>";
var_dump($soapclient->__getLastRequestHeaders());
echo "<br> ====== REQUEST ===== <br>";
var_dump(htmlentities($soapclient->__getLastRequest()));
echo "<br><br><br> ====== ResponseHeaders ===== <br>";
var_dump($soapclient->__getLastResponseHeaders());
echo "<br> ====== Response ===== <br>";
var_dump(htmlentities($soapclient->__getLastResponse()));

它仍然返回Null。和参数不发送。我是怎么做到的。谢谢你的帮助。