处理sms api的结果

Question

I work with a sms api that very bad :-| . when i sent arrays of numbers and message contents to it. the result is a string like this

 stdClass Object
([SendSMSResult] => stdClass Object
(
    [long] => Array
(
    [0] => 183153327
                [1] => 183153328
            )
    ))

it is realy like when we var_dumped but this is a string that api response to me,How can i access that two value 183153327 , 183153328. Can i convert this string to an array ??

that is not object is a string response and when I use

$result->SendSMSResult->long[0]

i have this error :

Trying to get property of non-object