> `V5.1`版本中当使用模型新增字段的时候可能会出现以下错误 ``` Automatically populating $HTTP_RAW_POST_DATA is deprecated and will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini and use the php://input stream instead. ```  > 可通过升级PHP版本解决（建议升级到PHP7.1+，6.0版本将不再支持5.6），或修改php.ini ``` always_populate_raw_post_data = -1 ```