How Can I Efficiently Group 2D Array Rows by a Column Value in PHP?

Grouping 2D Array Rows by a Column Value Effectively

In this example, we have a scenario where we need to group an array of associative arrays based on a specific column value, 'id'. The goal is to achieve this task without introducing duplicates while maintaining the original data structure.

While array_column() and array_unique() can partially achieve the grouping, it falls short in avoiding duplicates, as illustrated below:

function array_group_by_id($array) {
  return array_column($array, null, 'id');
}

$grouped_array = array_group_by_id($data);

To fully address this issue, we can utilize a loop-based approach:

$result = array();

foreach ($data as $element) {
  $result[$element['id']][] = $element;
}

This loop iterates over the original array, adding each element to the corresponding subarray within the 'result' array based on its 'id' value. This effectively creates a nested structure where each subarray contains rows from the original array that share the same 'id'.

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