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

Grouping 2D Array Data Based on Column Value to Create a 3D Array

When working with multidimensional arrays, it can become necessary to reorganize the data into different groupings. Let's consider a scenario where we have an array of customer information, and we need to group them according to their level. However, we do not have prior knowledge of the maximum level value.

To achieve this, we can exploit PHP's flexibility in array structures. Here's a step-by-step approach to group the data:

1. Create a temporary array to sort the data:

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

2. This loop iterates through each element in the original array and assigns each element to a specific level index in the $level_arr array. As a result, the $level_arr array groups the elements by their level values.

After the loop, the $level_arr array will have the desired grouped structure, with each level value representing a key for a nested array containing all the customer information at that level.

Alternatively, if you have control over the initial array's construction, it is more efficient to store the data in the desired structure from the start. This approach eliminates the need for a separate sorting step.

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