PHP多维数组合并相同的键和值

debugcn 发表于 Dev

迪尔西娜

我花了数小时试图找到这个问题的答案，但我一直在努力。我相当熟悉PHP和各种内置函数，并且可以构建一个复杂的foreach（）循环来执行此操作，但是我认为我想问问是否有人对我的问题有更明智的解决方案。

我有以下带有三个“行”的简化示例数组（实际数组通常更大，更复杂，但问题是相同的）。

$rows[] = [
    "widget_id" => "widget1",
    "size" => "large",
    "item" => [
        "item_id" => "item1",
        "shape" => "circle",
        "paint" => [
            "paint_id" => "paint1",
            "colour" => "red",
        ]
    ]
];

# Exactly the same as above, except the "paint" child array is different
$rows[] = [
    "widget_id" => "widget1",
    "size" => "large",
    "item" => [
        "item_id" => "item1",
        "shape" => "circle",
        "paint" => [
            "paint_id" => "paint2",
            "colour" => "green",
        ]
    ]
];

# Same children ("item" and "paint") as the first row, but different parents ("widget_id" is different)
$rows[] = [
    "widget_id" => "widget2",
    "size" => "medium",
    "item" => [
        "item_id" => "item1",
        "shape" => "circle",
        "paint" => [
            "paint_id" => "paint1",
            "colour" => "red",
        ]
    ]
];

我想要得到的是以下输出：

[[
    "widget_id" => "widget1",
    "size" => "large",
    "item" => [
        "item_id" => "item1",
        "shape" => "circle",
        "paint" => [[
            "paint_id" => "paint1",
            "colour" => "red",
        ],[
            "paint_id" => "paint2",
            "colour" => "green",
        ]]
    ]
],[
    "widget_id" => "widget2",
    "size" => "medium",
    "item" => [
        "item_id" => "item1",
        "shape" => "circle",
        "paint" => [
            "paint_id" => "paint1",
            "colour" => "red",
        ]
    ]
]]

基本上，当两行共享相同的键和值时，请合并它们。当键相同但值不同时，请保留两个值并将它们放在键下的数字数组中（类似如何array_merge_recursive操作）。

挑战在于值本身可以是数组，并且级别数未知。是否有一种聪明而有效的方法来执行此操作，还是我必须诉诸繁重的工作foreach循环？

感谢您的浏览，希望有比我更聪明的人阅读本文！

艾姆德夫

我通过以下功能获得了预期的数组结构，希望其中的注释是明确的：

function complex_merge(array $arr): array
{
    // Grouped items
    $result = [];
    $iterationKey = 0;

    // Loop through every item
    while (($element = array_shift($arr)) !== null) {
        // Save scalar values as is
        $scalarValues = array_filter($element, 'is_scalar');

        // Save array values in an array
        $arrayValues = array_map(fn(array $arrVal) => [$arrVal], array_filter($element, 'is_array'));
        $arrayValuesKeys = array_keys($arrayValues);

        $result[$iterationKey] = array_merge($scalarValues, $arrayValues);

        // Compare with remaining items
        for ($i = 0; $i < count($arr); $i++) {
            $comparisonScalarValues = array_filter($arr[$i], 'is_scalar');

            // Scalar values are same, add the array values to the containing arrays
            if ($scalarValues === $comparisonScalarValues) {
                $comparisonArrayValues = array_filter($arr[$i], 'is_array');
                foreach ($arrayValuesKeys as $arrayKey) {
                    $result[$iterationKey][$arrayKey][] = $comparisonArrayValues[$arrayKey];
                }

                // Remove matching item
                array_splice($arr, $i, 1);
                $i--;
            }
        }

        // Merge array values
        foreach ($arrayValuesKeys as $arrayKey) {
            $result[$iterationKey][$arrayKey] = complex_merge($result[$iterationKey][$arrayKey]);

            // array key contains a single item, extract it
            if (count($result[$iterationKey][$arrayKey]) === 1) {
                $result[$iterationKey][$arrayKey] = $result[$iterationKey][$arrayKey][0];
            }
        }

        // Increment result key
        $iterationKey++;
    }
    return $result;
}

只需传递$rows给函数，即可快速检查值：

echo '<pre>' . print_r(complex_merge($rows), true) . '</pre>';

/*
Displays:
Array
(
    [0] => Array
        (
            [widget_id] => widget1
            [size] => large
            [item] => Array
                (
                    [item_id] => item1
                    [shape] => circle
                    [paint] => Array
                        (
                            [0] => Array
                                (
                                    [paint_id] => paint1
                                    [colour] => red
                                )

                            [1] => Array
                                (
                                    [paint_id] => paint2
                                    [colour] => green
                                )

                        )

                )

        )

    [1] => Array
        (
            [widget_id] => widget2
            [size] => medium
            [item] => Array
                (
                    [item_id] => item1
                    [shape] => circle
                    [paint] => Array
                        (
                            [paint_id] => paint1
                            [colour] => red
                        )

                )

        )

)
*/

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