src/Day/Day.php
public static function getDaysOfWeek(): array
    {
        return [
            self::WEEK_DAY_MONDAY,
            self::WEEK_DAY_TUESDAY,
            self::WEEK_DAY_WEDNESDAY,
            self::WEEK_DAY_THURSDAY,
            self::WEEK_DAY_FRIDAY,
            self::WEEK_DAY_SATURDAY,
            self::WEEK_DAY_SUNDAY,
        ];
    }
public static function getDaysOfWeek(): array
    {
        return [
            self::WEEK_DAY_MONDAY,
            self::WEEK_DAY_TUESDAY,
            self::WEEK_DAY_WEDNESDAY,
            self::WEEK_DAY_THURSDAY,
            self::WEEK_DAY_FRIDAY,
            self::WEEK_DAY_SATURDAY,
            self::WEEK_DAY_SUNDAY,
        ];
    }
Get the days of week.

@return integer[]