Holiday

Holiday.php

<?php
class Holiday {
    
    public $dates = [];
    
    public function __construct(){
        $this->dates = [
            '1.1.',
            '8.5.',
            '5.7.',
            '6.7.',
            '28.9.',
            '28.10.',
            '17.11.',
            '24.12.',
            '25.12.',
            '26.12.',
            // easter is calculated automaticaly
        ];   
    }

    public function workingDay($date, $workingSaturday = false) {
        $today = mb_strtolower(date('D', $date));

        if ( ($workingSaturday === false && ($today == 'sat' || $today == 'sun')) || ($workingSaturday === true && $today == 'sun') ) {
            $nexMonday = strtotime('next Monday', $date);
            $isHoliday = $this->isHoliday($nexMonday);
            if ($isHoliday === false) {
                return $nexMonday;
            }
            return $this->workingDay($nexMonday);
        }

        if ($this->isHoliday($date)) {
            return $this->workingDay(strtotime('+1 day', $date));
        }

        return $date;
    }

    public function isHoliday($date) {
        $easterStart = easter_date(date('Y', $date));
        $easterFriday = strtotime('last Friday', $easterStart);
        $easterMonday = strtotime('next Monday', $easterStart);
        $holidays = $this->dates;
        array_push($holidays, date('j.n.', $easterFriday), date('j.n.', $easterMonday));
        return in_array(date('j.n.', $date), $holidays);
    } 
}