Description:
------------
Using the SoapServer it is possible to parse the SOAP headers. The way it goes is to use the element name as a function name. However, if the WSDL includes a dash ("-") in the header name, it isn't possible to write a function whose name includes a "-" character. Thus, the soap header can't be retrieved directly.

Reproduce code:
---------------
public function item-list($msg)
{
 $myFile = "c:\tmp.txt";
 $fh = fopen($myFile, 'w') ;
 fwrite($fh, var_export($msg, true)) ;
}
$server = new SoapServer("Receive Message Service.wsdl") ;
$server->addFunction("item-list");
$server->handle();

/* relevant WSDL parts 
<message name="Header">
<part name="itemPart" element="ns1:item-list"/>
</message>
<!-- etc -->
<input>
 <soap:body use="literal"/>
 <soap:header message="tns:Header" part="itemPart" use="literal"/>
</input> 
*/

Expected result:
----------------
The header should be printed to c:\tmp.txt but of course an error is thrown.

Actual result:
--------------
An error about the following line is thrown:

public function item-list

expected "(" where as "-"