实验数据：
2
609//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????
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没毛病啊
'{"msg":13,"infor":24,"ra1":[{"msg":13,"infor":24},{"msg":13,"infor":24},{"msg":13,"infor":24},123,3243]}'
ral的值是数组，所以用[]包含。
然后值的前三个又是一个json对象