breadthe / php-simple-calendar

    // If first day of month > 1 (first week doesn't start on a Monday)...

    // ...then pad the first week with remaining days from previous month

    private function padStart(): void

    {

        // what day in the week is the first of the month?

        $startOfMonthWeekday = $this->startOfMonth->isoWeekday();

        if ($startOfMonthWeekday > 1) {

            $currentMonth = $this->currentMonth;

            $daysToPad = $startOfMonthWeekday - 1;

            $prevMonth = CarbonPeriod::create(

                $this->startOfMonth->subDays($daysToPad),

                $this->startOfMonth->subDay()

            )->toArray();

            $this->padWithNull

                ? $this->currentMonth = array_pad($currentMonth, -(count($currentMonth) + $daysToPad), null)

                : $this->currentMonth = array_merge($prevMonth, $currentMonth);

        }

    }

    // If last day of month < 7 (last week doesn't end on a Sunday)...

    // ...then pad the last week with beginning days from next month

    // If last day of month < 7 (last week doesn't end on a Sunday)...

    // ...then pad the last week with beginning days from next month

    private function padEnd(): void

    {

        // what day in the week is the last of the month?

        $endOfMonthWeekday = $this->endOfMonth->isoWeekday();

        if ($endOfMonthWeekday < 7) {

            $currentMonth = $this->currentMonth;

            $daysToPad = 7 - $endOfMonthWeekday;

            $nextMonth = CarbonPeriod::create(

                $this->endOfMonth->addDay(),

                $this->endOfMonth->addDays($daysToPad)

            )->toArray();

            $this->padWithNull

                ? $this->currentMonth = array_pad($currentMonth, count($currentMonth) + $daysToPad, null)

                : $this->currentMonth = array_merge($currentMonth, $nextMonth);

        }

    }

}