前端传过来的参数是字符串的，需要转换一下再组成字符串

{"beginDate":"2019-04-01","endDate":"2019-04-25","indexCode":"000001","current":1,"size":"2","indexArray":[{"parentId":0,"childId":"0,1"}]}: 
 
 
$param['indexArray'] = $request->get('indexArray');
$param['indexArray']  = json_decode($param['indexArray'] ,true);
 
$argument = json_encode($argument);
 
indexArray是一个字符串，需要json_decode一下转行成php的数组，再重新json_incode一下转换成字符串调用java那边的接口