Правильный ли сделан execute запрос?

$code = urlencode('return API.wall.get(
          {
      "owner_id":"'.$group.'",
		  "filter":"owner",
		  "count":"2",
		  "access_token":"'.$token.'",
		  "v":"5.73"
          });
          ');
$groupinfo = json_decode(file_get_contents("https://api.vk.com/method/execute?code={$code}&access_token={$_SESSION['access_token']}"));