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有大佬 解释下吗？我是用PHP调的 $accesstoken = D('AccessToken');         $token = $accesstoken -> get_access_token();         $url = 'https://api.weixin.qq.com/tcb/databasecollectionadd?access_token='.$token;         $data = json_encode('env'=>'test-7n9e2','collection_name'=>'ceshi']);         $res = $this->http_post_data($url, $data);         return $this->toJson('Ok',$res);