$request_params->__set('reserveOrder', '');
$request_params->__set('reserveQuantity', '');
/* From OptionOrderRequest */
$request_params->__set('symbolInfo', $option_symbol_obj);
$request_params->__set('stopLimitPrice', '');
$request_params->__set('orderAction', 'BUY_OPEN');
//{BUY_OPEN, SELL_OPEN, BUY_CLOSE, SELL_CLOSE'}
$request_params->__set('priceType', 'LIMIT');
// { MARKET, LIMIT, STOP, STOP_LIMIT, MARKET_ON_CLOSE'}
$request_params->__set('marketSession', 'REGULAR');
// { REGULAR, EXTENDED }
$request_params->__set('orderTerm', 'GOOD_FOR_DAY');
//{ GOOD_UNTIL_CANCEL,GOOD_FOR_DAY,IMMEDIATE_OR_CANCEL,FILL_OR_KILL}
$request_params->__set('routingDestination', '');
$request_xml_object = new PreviewOptionOrder($request_params);
$out = $ac_obj->previewOptionOrder($request_xml_object);
break;
//5. Place Option Order
//5. Place Option Order
case 5:
//Build option_symbol_obj
$option_symbol_obj = new optionSymbol();
$option_symbol_obj->__set('symbol', 'AAPL');
$option_symbol_obj->__set('callOrPut', 'CALL');
/// enum : CALL,PUT;
$option_symbol_obj->__set('strikePrice', 115);
$option_symbol_obj->__set('expirationYear', '2011');
$option_symbol_obj->__set('expirationMonth', '11');
$option_symbol_obj->__set('expirationDay', '17');
//Build request_params
$request_params = new OptionOrderRequest();
