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How to Group a 2D Array by Column Value into a 3D Array?

Susan Sarandon
Susan SarandonOriginal
2024-11-02 17:28:29975browse

How to Group a 2D Array by Column Value into a 3D Array?

Group 2D Array Data Using Column Value for 3D Array

In programming, it's often necessary to manipulate and organize data structures effectively. Grouping data based on specific criteria is a common task. This article explores how to group a 2D array using a column value to create a 3D array.

Consider the following 2D array:

[
    ['cust' => 'XT8900', 'type' => 'standard', 'level' => 1],
    ['cust' => 'XT8944', 'type' => 'standard', 'level' => 1],
    ['cust' => 'XT8922', 'type' => 'premier', 'level' => 3],
    ['cust' => 'XT8816', 'type' => 'permier', 'level' => 3],
    ['cust' => 'XT7434', 'type' => 'standard', 'level' => 7],
]

Our objective is to group this data by the 'level' column, which effectively creates a 3D array. The desired output looks like this:

Array (

   [1] => Array (
          [0] => Array (
                    [cust] => XT8900
                    [type] => standard
                    )
          [1] => Array (
                    [cust] => XT8944
                    [type] => standard
                    )
          )

   [3] => Array (
          [2] => Array (
                 [cust] => XT8922
                 [type] => premier
                 )

          [3] => Array (
                 [cust] => XT8816
                 [type] => permier
                 )
          )

   [7] => Array (
          [4] => Array (
                 [cust] => XT7434
                 [type] => standard
                 )
          )
)

Optimal Approach

The most efficient solution is to create the 3D array directly if possible. However, if this is not feasible, we can use an intermediate temporary array for sorting:

<code class="php">foreach ($input_arr as $key => &$entry) {
    $level_arr[$entry['level']][$key] = $entry;
}</code>

This results in the desired 3D array structure. It's important to consider building the array in the final format from the beginning if possible, for optimal performance.

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