实验数据：

//关联数组
$result_array1['msg'] = 13;
$result_array1['infor'] = 24;
//索引数组
$arr = array(0,1,3);
$arr[0] = $result_array1;
$arr[1] = $result_array1;
$arr[2] = $result_array1;
$arr[3] = 123;
$arr[4] = 3243;

$result_array['msg'] = 13;
$result_array['infor'] = 24;
$result_array['ra1'] = $arr;

var_dump($result_array);
var_dump(json_encode($result_array));

浏览器输出：

array (size=3)
  'msg' => int 13
  'infor' => int 24
  'ra1' => 
    array (size=5)
      0 => 
        array (size=2)
          'msg' => int 13
          'infor' => int 24
      1 => 
        array (size=2)
          'msg' => int 13
          'infor' => int 24
      2 => 
        array (size=2)
          'msg' => int 13
          'infor' => int 24
      3 => int 123
      4 => int 3243

string '{"msg":13,"infor":24,"ra1":[{"msg":13,"infor":24},{"msg":13,"infor":24},{"msg":13,"infor":24},123,3243]}' (length=104)

实验结论：关联数组json表现为{}，索引数组表现为：[]
这个不是和json定义违背了吗?：

数组（在中括号中）

对象（在大括号中）

难道关联数组在PHP中是对象，而索引数组就不是对象，那它们的区别是什么????