DAverage.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\Database;

use PhpOffice\PhpSpreadsheet\Calculation\Statistical\Averages;

class DAverage extends DatabaseAbstract
{
    public static function evaluate($database, $field, $criteria)
    {
        $field = self::fieldExtract($database, $field);
        if ($field === null) {
            return null;
        }

        return Averages::average(
            self::getFilteredColumn($database, $field, $criteria)
        );
    }
}