php根据数组中的键名拆分数组

Question

当我提交表单时，我得到如下数组格式的输出：

Array ( [quantity_2] => 2 [extra_2] => 1 [quantity_1] => 1 [quantity_3] => 5 [extra_3] => 1 )

我想基于数组键的最后一个数字来拆分该数组，例如：

Array ( [quantity_2] => 2 [extra_2] => 1)
Array ( [quantity_1] => 1 [extra_2] => )
Array ( [quantity_3] => 5 [extra_3] => 1)

非常感谢您宝贵的重播。

Answer 1

我不认为有一种方法可以创建多个数组，而无需一个接一个地创建，因此可以得到的最接近的IMO是：

$arr = [
    'quantity_2' => 2,
    'extra_2' => 1,
    'quantity_1' => 1,
    'extra_1' => 10,
    'quantity_3' => 213,
    'extra_3' => 1
];

$newArray = [];
foreach ($arr as $key => $value) {
    $split = explode('_', $key);
    if (count($split) < 2) {
        continue;
    }

    $newArray[$split[1]][$split[0]] = $value;
}

print_r($newArray);

它的作用：-创建一个新的空数组-遍历所有元素-用下划线分隔键，并将第二部分用作id-根据您想要/可能想要的格式填充新数组-拥有一个看起来像一个新的结构化数组所以：

Array
(
    [2] => Array
        (
            [quantity] => 2
            [extra] => 1
        )

    [1] => Array
        (
            [quantity] => 1
            [extra] => 10
        )

    [3] => Array
        (
            [quantity] => 213
            [extra] => 1
        )
)

Answer 2

我认为这个简单的foreach会满足您的需求。

$input = [
    'quantity_2' => 2,
    'extra_2' => 1,
    'quantity_1' => 1,
    'quantity_3' => 5,
    'extra_3' => 1
];

$output = [];

foreach ($input as $key => $value) {
    list ($name, $id) = explode('_', $key);
    $output[(int)$id][$key] = $value;
}

$output = array_values($output);

var_dump($output);

Answer 3

对此做出了一些假设，并且没有添加任何错误检查，但这足以使您入门。

链接到示例代码

$arr = [
    'quantity_1' => 1,
    'extra_1' => 1,
    'quantity_2' => 2,
    'extra_2' => 2,
    'quantity_3' => 3,
    'extra_3' => 3
];

$formatted = [];
$pattern   = '/_(\d)+$/';
$matches   = null;
foreach ($arr as $key => $value) {
    preg_match($pattern, $key, $matches);
    $formatted[$matches[1]][$key] = $value;
}

print_r($formatted);

输出：

Array
(
    [1] => Array
        (
            [quantity_1] => 1
            [extra_1] => 1
        )

    [2] => Array
        (
            [quantity_2] => 2
            [extra_2] => 2
        )

    [3] => Array
        (
            [quantity_3] => 3
            [extra_3] => 3
        )

)