public static function years($start = false, $end = false) {
        // Default values
        $start = ($start === false) ? (date('Y') - 5) : (int)$start;
        $end = ($end === false) ? (date('Y') + 5) : (int)$end;

        $years = array();
        for ($i = $start; $i <= $end; $i++) {
            $years[$i] = (string)$i;
        }

        return $years;
    }