PHP 通过 oauth 获取用户信息乱码，求解。

{"openid":"oRPnH022222yPllUnTj4RCfAw","nickname":"绐︿笘瓒�","sex":1,"language":"zh_CN","city":"娴锋穩","province":"鍖椾含","country":"涓浗","headimgurl":"http:\/\/wx.qlogo.cn\/mmopen\/vi_32\/222222\/0","privilege":[]}