<?php

// Berlin - Germany
$c = IntlCalendar::createInstance('Europe/Berlin', 'de_DE');
$renderer = new CalendarMonthRenderer(new IntlDateFormatter('de_DE', null, null));
echo $renderer->render(new CalendarMonth($c));

// USA - New York
$c = IntlCalendar::createInstance('America/New_York', 'en_US');
$renderer = new CalendarMonthRenderer(new IntlDateFormatter('en_US', null, null));
echo $renderer->render(new CalendarMonth($c));


/**
 * This code snippet is no copy and paste example. It has no error
 * handling and isn't generic or clean written enough to be used in 
 * production.
 */
class CalendarMonth
{
    private $calendar;
    private $now;
    
    const DAY = IntlCalendar::FIELD_DATE;
    const MONTH = IntlCalendar::FIELD_MONTH;
    const DOW_LOCAL = IntlCalendar::FIELD_DOW_LOCAL;
    
    public function __construct(IntlCalendar $calendar)
    {
        $this->calendar = $calendar;
        $this->now = $calendar->getTime();
    }
    
    public function getNow()
    {
        return $this->now;
    }
    
    public function createStructure()
    {
        $calendar = $this->calendar;
        
        // beginning of the week
        $calendar->set(self::DAY, $calendar->getMinimum(self::DAY));
        $dayOfWeek = $calendar->get(self::DOW_LOCAL);
        $month = $calendar->get(self::MONTH);
        $calendar->add(self::DAY, -($dayOfWeek - 1));

        $structure = [];
        $week = [];
        while ($calendar->get(self::MONTH) <= $month || 
            !$this->isNewWeek($calendar)
        ) {
            if ($this->isNewWeek($calendar)) {
                $week = [];
            }
            
            $week[] = $calendar->getTime();
            
            if ($this->isEndOfWeek($calendar)) {
                $structure[] = $week;
                if ($calendar->get(self::MONTH) != $month) {
                    break;
                }
            }
            
            $calendar->add(self::DAY, 1);
        }
        
        return $structure;
    }
    
    private function isNewWeek(IntlCalendar $c)
    {
        return 1 === $c->get(self::DOW_LOCAL);
    }
    
    private function isEndOfWeek(IntlCalendar $c)
    {
        return 7 === $c->get(self::DOW_LOCAL);
    }
}

class CalendarMonthRenderer
{
    private $formatter;
    
    public function __construct(IntlDateFormatter $formatter)
    {
        $this->formatter = $formatter;
    }
    
    public function render(CalendarMonth $calendar)
    {
        $days = $weekdays = '';
        foreach ($calendar->createStructure() as $pos => $week) {
            $days .= '<tr>';
            foreach($week as $day) {
                if (0 === $pos) {
                    $weekdays .= '<td>' . $this->format($day / 1000, 'E') . '</td>';
                }
            
                $days .= '<td align="right">' . $this->format($day / 1000, 'd') . '</td>';
            }
            $days .= '</tr>';
        }
        
        $caption = '<caption>' . $this->format($calendar->getNow() / 1000, 'LLLL') . '</caption>';
        
        return '<table border="1">' . $caption . '<tr>' . $weekdays . '</tr>' . $days . '</table>';
    }
    
    private function format($c, $format)
    {
        $this->formatter->setPattern($format);
        return $this->formatter->format($c);
    }
}

Juli

Mo.	Di.	Mi.	Do.	Fr.	Sa.	So.
29	30	1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30	31	1	2

July

Sun	Mon	Tue	Wed	Thu	Fri	Sat
28	29	30	1	2	3	4
5	6	7	8	9	10	11
12	13	14	15	16	17	18
19	20	21	22	23	24	25
26	27	28	29	30	31	1

• CSV file with SplFileObject
• Basic usage of PDO
• Anonymous classes in PHP 7

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8