我目前有一个从mysql查询中使用json_encode的json，如下所示：

{"post_2":{"caption":"...","id":"...","accountID":"..","date":"07\/07\/2011 1:45:12 AM","title":"...","authorInfo":{"Email Address":"..."}}}, {"post_2":{"caption":"...","id":"...","accountID":"..","date":"07\/07\/2011 1:45:12 AM","title":"...","authorInfo":{"Email Address":"..."}}}

我怎样才能让json是帖子数组（“ post_2”，“
post_1”）而不是字典？JSON将在iPhone上使用SBJSON解码，并且必须将JSON制成后端的数组。

提前致谢。