表格存储php sdk中batchGetRow返回空数据问题

表格存储用php sdk调用batchGetRow接口，返回数据为空，但是在阿里云平台上可以查到

（调用getRow接口可以返回数据）

debug日志如下

OTS DEBUG 2018-09-07 18:42:58 BatchGetRow Request {"tables":[{"table_name":"MeterData","max_versions":1,"rows":[{"primary_key":[["uid",15],["tp","d"],["date","20180901"]]},{"primary_key":[["uid",15],["tp","d"],["date","20180902"]]},{"primary_key":[["uid",15],["tp","d"],["date","20180903"]]},{"primary_key":[["uid",15],["tp","d"],["date","20180904"]]},{"primary_key":[["uid",15],["tp","d"],["date","20180905"]]},{"primary_key":[["uid",15],["tp","d"],["date","20180906"]]}]}]}

OTS DEBUG 2018-09-07 18:43:00 BatchGetRow Response {"tables":[{"table_name":"MeterData","rows":[]}]}