What are the best practices for calculating averages from the previous 12 values in a multidimensional array in PHP?

When calculating averages from the previous 12 values in a multidimensional array in PHP, you will need to loop through the array and keep track of the last 12 values for each element. Once you have the last 12 values, you can calculate the average for each element. One approach is to use a sliding window technique to maintain the last 12 values for each element.

// Sample multidimensional array
$data = [
    [1, 2, 3, 4, 5],
    [6, 7, 8, 9, 10],
    [11, 12, 13, 14, 15]
];

$averages = [];

foreach ($data as $row) {
    $window = [];
    foreach ($row as $value) {
        $window[] = $value;
        if (count($window) > 12) {
            array_shift($window);
        }
        $averages[] = array_sum($window) / count($window);
    }
}

print_r($averages);