Php add 5 working days to current date excluding weekends (sat-sun) and excluding (multiple) holidays

Question

For delivery of our webshop, we need to calculate 5 working days from the current date in php.

Our working days are from monday to friday and we have several closing day

Answer 1

Based on Luke's answer:

Difference is that this one generates holidays for every year

 25, 'month' => 12],//christimas
        ['day' => 1, 'month' => 1],//new year
        ['day' => 13, 'month' => 4]//easter
    ];
    /**
     * @param int $numBusinessDays
     * @param \DateTimeInterface $date
     * @return \DateTime
     */
    public static function getFutureBusinessDay(int $numBusinessDays, \DateTimeInterface $date)
    {
        $numBusinessDays = min($numBusinessDays, 1000);
        $businessDayCount = 0;
        $currentTimestamp = strtotime($date->format('Y-m-d'));
        $holidayDates = self::getHolidayDates();
        while ($businessDayCount < $numBusinessDays) {
            $next1WD = strtotime('+1 weekday', $currentTimestamp);
            $next1WDDate = date('Y-m-d', $next1WD);
            if (!in_array($next1WDDate, $holidayDates)) {
                $businessDayCount++;
            }
            $currentTimestamp = $next1WD;
        }
        return (new \DateTime())->setTimestamp($currentTimestamp);
    }

    /**
     * @return array
     */
    private static function getHolidayDates()
    {
        $holidays = [];
        foreach (self::HOLIDAY_DATES as $holidayDate) {
            $date = new \DateTime();
            $date->setDate($date->format('Y'), $holidayDate['month'], $holidayDate['day']);
            $holidays[] = $date->format('Y-m-d');
        }
        return $holidays;
    }
}