Undefined property: SoapClient::$_cookies

``` php
$soapClientAuth = new SoapClient($wsdlauthurl, ['exceptions' => true]);
$this->soapClientAuth->Login(...); //method call
var_dump($this->soapClientAuth->_cookies);
```

HipHop VM 3.0.0-dev (rel)
Compiler: heads/master-0-g5b00837d9b2ecc28e6225336296be88449637b2e
Repo schema: b602fe3a78ec9eec7b65ec874110b9323ceabf88

``` bash
Undefined property: SoapClient::$_cookies
```

PHP 5.5.9-1 (cli) (built: Feb 7 2014 18:09:20)

``` php
array(1) {
'ASP.NET_SessionId' =>
array(3) {
... //cookie data
}
}
```