code optimations: replaced call_user_func[_array] by () or ->() or ::…

…() if possible | replaced call_user_funx_array by call_user_func if possible | removed double ';;' | check if DIRECTORY_SEPARATOR is already a backslash (windows) | replaced strripos by strrpos to find the last backslash

src/Client.php

@@ -964,9 +964,11 @@ public function _doRequest(Client\Common $client, $request, $location, $action,
     {
         // Perform request as is
         if ($one_way == null) {
-            return call_user_func(array($client,'SoapClient::__doRequest'), $request, $location, $action, $version);
+            $client->__doRequest($request, $location, $action, $version);
+            // return call_user_func(array($client,'SoapClient::__doRequest'), $request, $location, $action, $version);
         } else {
-            return call_user_func(array($client,'SoapClient::__doRequest'), $request, $location, $action, $version, $one_way);
+            $client->__doRequest($request, $location, $action, $version, $one_way);
+            // return call_user_func(array($client,'SoapClient::__doRequest'), $request, $location, $action, $version, $one_way);
         }
     }