How can I group a multidimensional array by multiple column values and sum another column's values?

Grouping Multidimensional Array Data by Multiple Column Values and Summing Column Values

Problem:

This problem involves an array with data from multiple database queries across different databases. The goal is to group the array elements based on two column values ("part" and "type") and calculate the sum of a third column ("count") for each group.

Array Example:

<code class="php">$arr1 = [
    ['part' => '1', 'address' => 'aaa', 'type' => '1', 'count' => 5],
    ['part' => '1', 'address' => 'bbb', 'type' => '1', 'count' => 5],
    ['part' => '1', 'address' => 'ccc', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'aaa', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'bbb', 'type' => '1', 'count' => 5],
    ['part' => '2', 'address' => 'ccc', 'type' => '2', 'count' => 5]
];</code>

Desired Output:

<code class="php">$arr2 = [
    ['part' => '1', 'type' => '1', 'count' => 15],
    ['part' => '2', 'type' => '1', 'count' => 10],
    ['part' => '2', 'type' => '2', 'count' => 5]
];</code>

Solution:

To group the array elements and sum the "count" values, the following function can be used:

<code class="php">function groupByPartAndType($input) {
  $output = Array();

  foreach($input as $value) {
    $output_element = &amp;$output[$value['part'] . "_" . $value['type']];
    $output_element['part'] = $value['part'];
    $output_element['type'] = $value['type'];
    !isset($output_element['count']) && $output_element['count'] = 0;
    $output_element['count'] += $value['count'];
  }

  return array_values($output);
}</code>

This function iterates through the input array, identifying the "part" and "type" values for each element. It then uses these values as keys to create or retrieve output elements. For each key, the function initializes a "count" field if it doesn't exist and increments it with the value of that element's "count" field. Finally, it returns an array containing the grouped elements.

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