private function getAlphaNumber($number, $lowerCase = false)
    {
        $asciiStartIndex = $lowerCase ? 97 : 65;
        $alpha = '';
        while ($number > 0) {
            $modulus = ($number - 1) % 26;
            $alpha .= chr($modulus + $asciiStartIndex);
            $number = floor(($number - 1) / 26);
        }
        return strrev($alpha);
    }