基于键值将多维关联数组回显到列表中

Question

我想根据它们所属的类型将以下数组排序并回显到单独的列表中。

Array
(
    [0] => Array
    (
        [itemid] => 1
        [itemname] => Sword
        [itemtype] => Standard
    )

    [1] => Array
    (
        [itemid] => 2
        [itemname] => Dagger
        [itemtype] => Standard
    )

     [2] => Array
    (
        [itemid] => 3
        [itemname] => Backpack
        [itemtype] => Standard
    )

    [3] => Array
    (
        [itemid] => 4
        [itemname] => Rope (50ft)
        [itemtype] => Standard
    )

    [4] => Array
    (
        [itemid] => 5
        [itemname] => Tinderbox
        [itemtype] => Standard
    )

    [5] => Array
    (
        [itemid] => 6
        [itemname] => Torch
        [itemtype] => Standard
    )

    [6] => Array
    (
        [itemid] => 6
        [itemname] => Torch
        [itemtype] => Standard
    )

    [7] => Array
    (
        [itemid] => 6
        [itemname] => Torch
        [itemtype] => Standard
    )

    [8] => Array
    (
        [itemid] => 6
        [itemname] => Torch
        [itemtype] => Standard
    )

    [9] => Array
    (
        [itemid] => 6
        [itemname] => Torch
        [itemtype] => Standard
    )

    [10] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [11] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [12] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [13] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [14] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [15] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [16] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [17] => Array
    (
        [itemid] => 8
        [itemname] => Bread
        [itemtype] => Provisions
    )

    [18] => Array
    (
        [itemid] => 9
        [itemname] => Healing Salve
        [itemtype] => Magical
    )

    [19] => Array
    (
        [itemid] => 9
        [itemname] => Healing Salve
        [itemtype] => Magical
    )

)

我想基于itemtype键将其回显到列表中。即：

Standard
=========
Sword Dagger Backpack Rope (50ft) Tinderbox Torch x5

Provisions
=========
Bread x8

Magical
=========
Healing Salve

我尝试这样做无济于事：

    foreach ($array as $value) {
        if ($value['itemtype'] == 'Standard'){
            echo $value['itemname'] . "\n";
        }
    foreach ($array as $value) {
        if ($value['itemtype'] == 'Provisions'){
            echo $value['itemname'] . "\n";
        }
    foreach ($array as $value) {
        if ($value['itemtype'] == 'Magical'){
            echo $value['itemname'] . "\n";
        }

首先将它分成单独的数组可能更明智吗？

Answer 1

您还可以将项目添加到3个不同的字符串中，并在结尾处回显连接的字符串：

$standard = '';
$provisions = '';
$magical = '';

foreach ($array as $value) {
    switch $value['itemtype']{
        case 'Standard':
            $standard .= $value['itemname'] . "\n";
            break;
        case 'Provisions':
            $provisions .= $value['itemname'] . "\n";
            break;
        case 'Magical':
            $magical .= $value['itemname'] . "\n";
            break;
        default:
            break;
    }
}
echo $standard . $provisions . $magical;

因此，您只需要在阵列上循环一次，就可以轻松添加更多案例。