关于json_encode一个二维数组,返回一个数组对象还是对象对象

$users = array(
    ‘1‘=>array(‘id‘=>1,‘age‘=>‘1‘),
   ‘2‘ => array(‘id‘=>2,‘age‘=>‘2‘),

<?php
$users = array(
    array(‘id‘=>1,‘age‘=>‘1‘),
    array(‘id‘=>2,‘age‘=>‘2‘),
    array(‘id‘=>3,‘age‘=>‘3‘),
    array(‘id‘=>4,‘age‘=>‘4‘),
    array(‘id‘=>5,‘age‘=>‘5‘),
    array(‘id‘=>1,‘age‘=>‘1‘),
    array(‘id‘=>2,‘age‘=>‘2‘),
    array(‘id‘=>3,‘age‘=>‘3‘),
    array(‘id‘=>4,‘age‘=>‘4‘),
    array(‘id‘=>5,‘age‘=>‘5‘),
    array(‘id‘=>1,‘age‘=>‘1‘),
    array(‘id‘=>2,‘age‘=>‘2‘),
    array(‘id‘=>3,‘age‘=>‘3‘),
    array(‘id‘=>4,‘age‘=>‘4‘),
    array(‘id‘=>5,‘age‘=>‘5‘),
);