带有PHP和MySQL的JSON嵌套数组

Question

我正在尝试使用PHP / PDO从MySQL提取数据并将其格式化为嵌套的JSON数组。

这是我得到的：

{
    "host1": [
        {
            "vmnic_name": "vmnic0",
            "switch_name": "switch1",
            "port_id": "GigabitEthernet1\/0\/1"
        },
        {
            "vmnic_name": "vmnic1",
            "switch_name": "switch1",
            "port_id": "GigabitEthernet1\/0\/2"
        }
    ],
    "host2": {
        "2": {
            "vmnic_name": "vmnic0",
            "switch_name": "switch1",
            "port_id": "GigabitEthernet1\/0\/3"
        },
        "3": {
            "vmnic_name": "vmnic1",
            "switch_name": "switch1",
            "port_id": "GigabitEthernet1\/0\/4"
        }
    }
}

我想说“ host_name”：“ host1”等，而不只是“ host1”。对于第一个主机之后的主机，不要像第一个主机那样具有“ 2”或“ 3”之类的数字。

这是我的代码：

$arr = array();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $key => $item) {
    $arr[$item['host_name']][$key] = array(
            'vmnic_name'=>$item['vmnic_name'],
            'switch_name'=>$item['switch_name'],
            'port_id'=>$item['port_id']
    );
}
echo json_encode($arr, JSON_PRETTY_PRINT);

任何帮助将不胜感激。

Answer 1

如果只选择查询中的那些列，那么就这么简单：

foreach ($result as $item) {
    $arr[$item['host_name']][] = $item;
}

如果出于任何原因必须选择更多列以供以后使用，则只需插入host_name并删除$key作为索引：

foreach ($result as $key => $item) {
    $arr[$item['host_name']][] = array(
            'host_name'=>$item['host_name'],
            'vmnic_name'=>$item['vmnic_name'],
            'switch_name'=>$item['switch_name'],
            'port_id'=>$item['port_id']
    );
}

Answer 2

这很容易。将其解码为一个数组，然后将其粘贴到另一个数组中。

$array = json_decode($json, true);
$x = [];
$x['host_name'] = $array;

var_dump(json_encode($x, JSON_PRETTY_PRINT));

哪个会给你：

string(747) "{ "host_name": { "host1": [ { "vmnic_name": "vmnic0", "switch_name": "switch1", "port_id": "GigabitEthernet1\/0\/1" }, { "vmnic_name": "vmnic1", "switch_name": "switch1", "port_id": "GigabitEthernet1\/0\/2" } ], "host2": { "2": { "vmnic_name": "vmnic0", "switch_name": "switch1", "port_id": "GigabitEthernet1\/0\/3" }, "3": { "vmnic_name": "vmnic1", "switch_name": "switch1", "port_id": "GigabitEthernet1\/0\/4" } } } }"

https://3v4l.org/PlbON