Guzzle从带有破折号的房产获得价值？

when I make a request with Guzzle:

$response = json_decode($client->get($uri)->getBody()->getContents());

var_dump($response); die;

I get this in var_dump:

stdClass (object) [Object ID #2395][3 properties]
contacts: 
(array) [250 elements]
has-more: (boolean) true 
vid-offset: (integer) 111259

When I make $response->contacts I get all contacts, no problem there but this vid-offset has a - in it's name so this doesn't work:

$response->vid-offset

and I tried this also:

$response['vid-offset'];

And I get this error: Cannot use object of type stdClass as array

I've also tried doing :

$response->getAttribute('vid-offset')

But it still didn't work.

How to get the value of vid-offset property?

You can get it this way :

$response->{'vid-offset'};