Description:
------------
function function1() {
  return new SoapVar("some text",XSD_STRING);
}
function function2() {
  return new SoapVar("<tag>some text</tag>",XSD_ANYXML);
}

$soapserver = new SoapServer("mywsdl.wsdl");
$soapserver->addFunction("function1");
$soapserver->addFunction("function2");
$soapserver->handle();

Requesting function1 will produce

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="myns">
   <SOAP-ENV:Body>
      <ns1:function1Response>some text</ns1:function1Response>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

but requesting function2 will produce

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="myns">
   <SOAP-ENV:Body>
      <tag>some text</tag>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

The method name response tags are missing here. The Body-part should be

<ns1:function2Response>
  <tag>some text</tag>
</ns1:function2Response>

Response-tags should come from WSDL as with function1.

This behaviour is also demostrated in http://www.herongyang.com/WSDL/PHP-SOAP-XSD_ANYXML-Build-SOAP-Body-Element.html