经过测试，可以正常工作！

• 使用https，用户名和密码

          <?php 
      //Data, connection, auth
      $dataFromTheForm = $_POST['fieldName']; // request data from the form
      $soapUrl = "https://connecting.website.com/soap.asmx?op=DoSomething"; // asmx URL of WSDL
      $soapUser = "username";  //  username
      $soapPassword = "password"; // password
  
      // xml post structure
  
      $xml_post_string = '<?xml version="1.0" encoding="utf-8"?>
                          <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
                            <soap:Body>
                              <GetItemPrice xmlns="http://connecting.website.com/WSDL_Service"> // xmlns value to be set to your's WSDL URL
                                <PRICE>'.$dataFromTheForm.'</PRICE> 
                              </GetItemPrice >
                            </soap:Body>
                          </soap:Envelope>';   // data from the form, e.g. some ID number
  
         $headers = array(
                      "Content-type: text/xml;charset=\"utf-8\"",
                      "Accept: text/xml",
                      "Cache-Control: no-cache",
                      "Pragma: no-cache",
                      "SOAPAction: http://connecting.website.com/WSDL_Service/GetPrice", 
                      "Content-length: ".strlen($xml_post_string),
                  ); //SOAPAction: your op URL
  
          $url = $soapUrl;
  
          // PHP cURL  for https connection with auth
          $ch = curl_init();
          curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
          curl_setopt($ch, CURLOPT_URL, $url);
          curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
          curl_setopt($ch, CURLOPT_USERPWD, $soapUser.":".$soapPassword); // username and password - declared at the top of the doc
          curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
          curl_setopt($ch, CURLOPT_TIMEOUT, 10);
          curl_setopt($ch, CURLOPT_POST, true);
          curl_setopt($ch, CURLOPT_POSTFIELDS, $xml_post_string); // the SOAP request
          curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  
          // converting
          $response = curl_exec($ch); 
          curl_close($ch);
  
          // converting
          $response1 = str_replace("<soap:Body>","",$response);
          $response2 = str_replace("</soap:Body>","",$response1);
  
          // convertingc to XML
          $parser = simplexml_load_string($response2);
          // user $parser to get your data out of XML response and to display it.
  ?>