Description:
------------
when i use soap to open a complex wsdl...
and then pass in a stdclass object to be send as parameter...

came out crash:

Catchable fatal error: Object of class stdClass could not be converted to string in ...

this crash is not captured by try / catch



Reproduce code:
---------------
  $client = new SoapClient("http://demo.touricoholidays.com/ws/AmendmentServices.asmx?WSDL",

     Array( 

        "trace"      => 1, 

        "exceptions" => 1,

        "encoding" => "ISO-8859-1" 

      )

  );

  

  

  $tcost = new stdClass();

  //adding this below gives similar problem...  
  //$tcost->CostAmendObj = new stdClass();
  //$tcost->CostAmendObj->IsOnlyAvailable = "true";
  

  try { 
        //this statement causes the error...
  	echo "Result: " . $client->costamend( $tcost );

  } catch ( Exception $e )
  {
  	var_dump( $e->getMessage() );
  }

Expected result:
----------------
soap response xml

Actual result:
--------------
Catchable fatal error: Object of class stdClass could not be converted to string in ...