["{\"parentgroup\":\"\",\"groupid\":\"Groups\"}","{\"parentgroup\":\"Groups\",\"groupid\":\"总裁办\"}","{\"parentgroup\":\"Groups\",\"groupid\":\"运营部\"}","{\"parentgroup\":\"Groups\",\"groupid\":\"财务部\"}","{\"parentgroup\":\"Groups\",\"groupid\":\"研发部\"}","{\"parentgroup\":\"Groups\",\"groupid\":\"市场部\"}"]这样的json数据我应该怎么解压成数组，如果用json_decode那么返回的话也不行
