How to Group Data in a Multidimensional Array Based on Column Values?

Grouping Multidimensional Array Data using Column Value to Create a 3D Array

To group a multidimensional array based on the value of a specific column, you can leverage various strategies depending on your control over the initial array structure.

Scenario 1: Control over Initial Array

If you have the freedom to design the initial array, it is recommended to incorporate the desired grouping as part of its structure. This eliminates the need for subsequent manipulation.

Scenario 2: No Control over Initial Array

If you do not control the initial array structure, you can create a temporary array to facilitate grouping:

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

This code traverses the input array, extracting the 'level' value for each entry. It then initializes an array keyed by the 'level' value, assigning the entry to the corresponding subarray.

The resulting array, $level_arr, is structured with keys representing the distinct 'level' values, and values containing subarrays of entries grouped by their 'level'. This matches the desired output format.

Conclusion

Grouping a multidimensional array by a specific column value is a common operation. By understanding the available strategies, you can effectively organize your data for further processing or analysis. Whether you have control over the initial array structure or not, there are suitable approaches to achieve the desired result.

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