PHP Soap调用.net webservice丢失第一个参数

这两天使用php调用.net做的webservice，一直不成功。

$output = $soap->__soapCall("sds", array(new SoapParam("192.168.0.100", "ip"), new SoapParam("abcdefg", "input")));

POST /PostLiftData.asmx HTTP/1.1
Host: 192.168.0.113:9001
Connection: Keep-Alive
User-Agent: PHP-SOAP/5.3.8
Content-Type: application/soap+xml; charset=utf-8; action="http://tempuri.org/sds"
Content-Length: 206

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:ns1="http://tempuri.org/"><env:Body><ns1:sds/><input>abcdefg</input></env:Body></env:Envelope>

$output = $soap->__soapCall("sds", array('', new SoapParam("192.168.0.100", "ip"), new SoapParam("abcdefg", "input")));

POST /PostLiftData.asmx HTTP/1.1
Host: 192.168.0.113:9001
Connection: Keep-Alive
User-Agent: PHP-SOAP/5.3.8
Content-Type: application/soap+xml; charset=utf-8; action="http://tempuri.org/sds"
Content-Length: 228

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:ns1="http://tempuri.org/"><env:Body><ns1:sds/><ip>192.168.0.100</ip><input>abcdefg</input></env:Body></env:Envelope>

------------------------------------------------------------------------------

发现了问题，原来php调用.net的SOAP是需要这样子调用：

$params = array('ip'=>"192.168.0.100", 'input'=>"abcdefg");
$output = $soap->__soapCall("sds", array("parameters" => $params));