接口返回值中數組中包含多個json對象形式

返回數據Json：
 {
    “code”: 200,
    ”msg”: ”成功”,
    ”departmentlist”: [
        {
            "id": "32",
            "name": "軟件部"
            
        }
    ],
    ”userlist”: [
        {
            "id": "11",
            "headiconurl": "用戶頭像地址",
            "truename": "姓名",
            "positionname": "職位"
        }
    ]
}

php接口代碼

        前面的查詢符合條件sql語句已省略. 
 
         $arr=array();
         $arr['code']=200;
         $arr['msg']='成功';
         $arr['departmentlist'][]=array(
                'id'=>$dept['id'],
                'name'=>$dept['name'],
            );
         foreach($deptmember as $key=>$val) {

             $arr['userlist'][] = array(
                 'id' => $val['id'],
                 'headiconurl' => $val['face'],
                 'truename' => $val['name'],
                 'positionname' => $val['ranking'],
             );
         }
        echo json_encode($arr,true);