json字符串拼接 json_encode 数组带有花括号{}和中括

字母索引的数组的是花括号，数字索引才是中括号

数字索引的数组示例：

$p = array('name'=>'yu','age'=>'23');
$data[0]['name']='zhangsan';
$data[0]['orderDate']='2018-02';
$data[0]['price']='58';
$data[0]['prodcut'][0]['prodcut_id']='101';
$data[0]['prodcut'][0]['prodcut_price']='28';
$data[0]['prodcut'][0]['prodcut_name']='毛巾';
$data[0]['prodcut'][1]['prodcut_id']='102';
$data[0]['prodcut'][1]['prodcut_price']='30';
$data[0]['prodcut'][1]['prodcut_name']='浴巾';

$data=json_encode($data);
echo $data;
exit;
//结果如下：
[{"name":"zhangsan","orderDate":"2018-02","price":"58","prodcut":[{"prodcut_id":"101","prodcut_price":"28","prodcut_name":"u6bdbu5dfe"},{"prodcut_id":"102","prodcut_price":"30","prodcut_name":"u6d74u5dfe"}]}]

字母索引的数组示例：

$p = array('name'=>'yu','age'=>'23');
$data=json_encode($p);
echo $data;
exit;
//结果如下：
{"name":"yu","age":"23"}