How to Reindex Subarrays in a Multidimensional Array?

Reindexing Subarrays of Multidimensional Arrays

Question:

How do we reset the keys of all subarrays within a multidimensional array? For instance, consider the array:

[
    '1_Name' => [
        '1' => 'leo',
        '4' => null
    ],
    '1_Phone' => [
        '1' => '12345',
        '4' => '434324'
    ],
]

We aim to transform it into:

[
    '1_Name' => [
        '0' => 'leo',
        '1' => null
    ],
    '1_Phone' => [
        '0' => '12345',
        '1' => '434324'
    ],
]

Answer:

To re-index the keys of all arrays within an array, we employ array_map in conjunction with array_values. Here's the code:

<code class="php">$arr = array_map('array_values', $arr);</code>

array_values resets the keys of a single array, while array_map applies this operation to every subarray in the parent array.

Alternatively, if we only need to re-index the keys of the first-level arrays, we can use array_values directly:

<code class="php">$arr = array_values($arr);</code>

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