CalendarInterface.php

<?php

namespace Calendar;

use DateTimeInterface;

interface CalendarInterface
{
    /**
     * @param DateTimeInterface $datetime
     */
    public function __construct(DateTimeInterface $datetime);

    /**
     * Get the day
     *
     * @return int
     */
    public function getDay();

    /**
     * Get the weekday (1-7, 1 = Monday)
     *
     * @return int
     */
    public function getWeekDay();

    /**
     * Get the first weekday of this month (1-7, 1 = Monday)
     *
     * @return int
     */
    public function getFirstWeekDay();

    /**
     * Get the first week of this month (18th March => 9 because March starts on week 9)
     *
     * @return int
     */
    public function getFirstWeek();

    /**
     * Get the number of days in this month
     *
     * @return int
     */
    public function getNumberOfDaysInThisMonth();

    /**
     * Get the number of days in the previous month
     *
     * @return int
     */
    public function getNumberOfDaysInPreviousMonth();

    /**
     * Get the calendar array
     *
     * @return array
     */
    public function getCalendar();
}