Description:
------------
When a soap server returns nested standard class functions more then 2 layers deep the resulting xml is invalid causing an error on the client side with no error report on the server side.

Test script:
---------------
<?php

//connect to soap server
$options= array(
  'location' 	=>	'https://way.bz/~soap_test',
  'uri'			=>	'https://way.bz/~soap_test',
  'soap_version' => SOAP_1_2
);
$client=new SoapClient(NULL,$options);
		
		
print_r($client->good());		//returns json_decode('{"tc": {"info": "h","st": 7}}');
print_r($client->noGood());		//returns json_decode('{"tc": {"info": {"10": {"l": 0}},"st": {"13": 13}}}');

Expected result:
----------------
Don't expect a fatal error.

Actual result:
--------------
stdClass Object ( [tc] => stdClass Object ( [info] => h [st] => 7 ) ) 
Fatal error: Uncaught SoapFault exception: [Sender] looks like we got no XML document in C:\xampp\htdocs\ipswork\t.php:13 Stack trace: #0 C:\xampp\htdocs\ipswork\t.php(13): SoapClient->__call('noGood', Array) #1 {main} thrown in C:\xampp\htdocs\ipswork\t.php on line 13