How to Re-index Subarray Elements in a Multidimensional PHP Array?

Re-indexing Subarray Elements in a Multidimensional Array

Resetting the keys of subarrays in a multidimensional array can be a common task in PHP. This article addresses the question of how to achieve this goal.

Problem:

Consider the following array:

<code class="php">Array (
    [1_Name] => Array (
        [1] => leo
        [4] => NULL
    )
    [1_Phone] => Array (
        [1] => 12345
        [4] => 434324
    )  
)</code>

The task is to re-index the subarrays as follows:

<code class="php">Array (
    [1_Name] => Array (
        [0] => leo
        [1] => NULL
    )
    [1_Phone] => Array (
        [0] => 12345
        [1] => 434324
    )
)</code>

Solution:

To reset the keys of all arrays in an array, you can use the following code:

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

If you only want to reset the first-level array keys, you can use array_values() without array_map:

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

Explanation:

The array_map() function applies a user-defined function to each element of an array. In this case, the user-defined function is array_values, which returns an array with the values of the input array. By applying array_values to each subarray of the original array, we effectively reset the keys of those subarrays.

The array_values() function returns a new array that contains the values of the input array. When used on a multidimensional array, it returns an array of arrays, where each subarray contains the values of the corresponding subarray from the input array. By assigning the result of array_values() to the original array variable, we effectively reset the keys of the subarrays in the original array.

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