因此，我在我们的企业环境中尝试做的是在wsdl模式下使用PHP类SoapClient连接到SAP Web服务。
到目前为止，我所完成的是得到“丢失属性”错误。在解决所有丢失属性错误后，我得到了可怕的http错误500的正文：soap-env：服务器
这是我的代码：

class SapTest {
 const SAP_WSDL_URI  = *wsdl_uri*;
 const SAP_USER = *username*;
 const SAP_PWD  = *password*;

public function execute() {

        $client = new SoapClient('http://'.urlencode(self::SAP_USER).':'.urldecode(self::SAP_PWD).'@'.self::SAP_WSDL_URI,
                array("trace" => 1,
                      "exceptions" => 1,
                      "login" => self::SAP_USER,
                      "password" => self::SAP_PWD,
                      'features' => SOAP_SINGLE_ELEMENT_ARRAYS)
        );

        $method = '_-bic_-nf2';

        $parameter = array('ETColumnDescription' => null,
                           'ETGridData' => null,
                           'ETMessageLog' => null,
                           'ETRowDescription' => null,
                           'ISVar_01xwerbet' => array('Sign' => 'I',
                                                      'Option' => 'LE',
                                                      'Low' => '3',
                                                      'High' => null));

        try
        {

        $result = $client->$method($parameter);
        print_r($result);
        } catch(SoapFault $e) {

        echo "REQUEST HEADER:\n" . $client->__getLastRequestHeaders() . "\n";
          echo "REQUEST:\n" . $client->__getLastRequest() . "\n";

          echo "RESPONSE HEADER:\n" . $client->__getLastResponseHeaders() . "\n";

          echo "RESPONSE:\n" . $client->__getLastResponse() . "\n";
        print_r($e);
    }

}

}

$oSap = new SapTest();
$oSap->execute();

我xml输出如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="urn:sap-com:document:sap:soap:functions:mc-style">
 <SOAP-ENV:Body>
  <ns1:_-bic_-nf2>
   <ETColumnDescription/>
   <ETGridData/>
   <ETMessageLog/>
   <ETRowDescription/>
   <ISVar_01xwerbet>
    <Sign>I</Sign>
    <Option>LE</Option>
    <Low>3</Low>
    <High/>
   </ISVar_01xwerbet>
  </ns1:_-bic_-nf2>
 </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

预期的XML应该如下所示：

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:sap-com:document:sap:soap:functions:mc-style">
 <soapenv:Body>
  <urn:_-bic_-nf2>
   <ETColumnDescription/>
   <ETGridData/>
   <ETMessageLog/>
   <ETRowDescription/>
   <ISVar_01xwerbet>
    <Sign>I</Sign>
    <Option>LE</Option>
    <Low>3</Low>
    <High/>
   </ISVar_01xwerbet>
  </urn:_-bic_-nf2>
 </soapenv:Body>
</soapenv:Envelope>

我不确定是否是缺少了空白的header标签，我似乎不能用基本的PHP添加它（我可以添加一个header，但是添加一个空白的header似乎是困难的部分）。或者是不同的前缀（ns 1/urn或soapenv/SOAP-ENV），但是我已经开始为此发疯了。帮助将是非常感谢的。
提前感谢！