在php中标准化多维数组

debugcn 发表于 Dev

达科

我有一个这样的多维数组

Array
(
[0] => Array
    (
        ['key-A'] => 'val1'
        ['key-B'] => 'val2'
    )
[1] => Array
    (
        ['key-A'] => 'val3'
        ['key-C'] => 'val4'
    )
[2] => Array
    (
        ['key-B'] => 'val5'
        ['key-C'] => 'val6'
    )
)

我如何将其更改为标准化的多维数组，以便所有键都存在，如果不存在键，则输入一个空值？

例如。

Array
(
[0] => Array
    (
        ['key-A'] => 'val1'
        ['key-B'] => 'val2'
        ['key-C'] => null
    )
[1] => Array
    (
        ['key-A'] => 'val3'
        ['key-B'] => null
        ['key-C'] => 'val4'
    )
[2] => Array
    (
        ['key-A'] => null
        ['key-B'] => 'val5'
        ['key-C'] => 'val6'
    )
)

爱因

<?php
$arrays = [
    [
        'key-A' => 'val1',
        'key-B' => 'val2',
    ],
    [
        'key-A' => 'val3',
        'key-C' => 'val4',
    ],
    [
        'key-B' => 'val5',
        'key-C' => 'val6',
    ],
];

// First build up a single array containing all the keys present
$allKeys = [];

foreach ($arrays as $array)
{
    $allKeys = array_unique(array_merge(array_keys($array), $allKeys));
}

// Then loop over the original array, merging the existing values into an array
// containing all the known keys
foreach ($arrays as &$array)
{
    $array = array_merge(array_combine(
        $allKeys,
        array_fill(0, count($allKeys), null)
    ), $array);
}

print_r($arrays);

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