Base Class for Making A Calendar in PHP

CalendarBase.php

<?php

//if you use it in a namespace, you'll need this line
//use \DateTime as DateTime;

//TODO: needs documentation and testing

/**
*	Takes month and year, returns days of the month, next and prev month etc
* 	its used like $calendar = new CalendarBase(8,2014);
*/
class CalendarBase {
	


	public $month;
	
	public $year;

	//local month name
	public $monthName;

	/*
	* DateTime object of given month
	*/
	public $date;
	public $dateObj;

	/*
	* How many days in this year
	*/
	public $dayCount;

	public $startingDay;

	public $dayOffset;

	/**
	* Next month in array, year&month parameters
	*/
	public $nextMonth = array();

	/**
	* Prev month in array, first param month, next param year
	*/
	public $prevMonth = array();

	public static $calendar = CAL_GREGORIAN;

	public function __construct($month,$year)
	{

		$this->month    = $month;
		$this->year     = $year;
		
		//try to build datetime obj
		try {
		    $date = new DateTime($this->year.'-'.$this->month);
		} catch (Exception $e) {
		    echo $e->getMessage();
		    exit(1);
		}
		$this->dateObj = $date;
		$this->date = $date->format('Y-m');

		//next prev months
		$this->nextMonth();

		$this->prevMonth();

		$this->dayCount();

		$this->startingDay();

		$this->monthName = static::monthName($this->date);
	}


	private function dayCount()
	{
		$this->dayCount = cal_days_in_month(static::$calendar,$this->month,$this->year);
	}

	private function startingDay()
	{
		$this->startingDay = $this->dateObj->format('N');
		$this->dayOffset = $this->startingDay - 1;
	}

	private function nextMonth()
	{

		$this->nextMonth['year']  = date('Y',strtotime('+1 month',strtotime($this->date)));
		$this->nextMonth['month'] = date('m',strtotime('+1 month',strtotime($this->date)));
		$this->nextMonth['daycount'] = cal_days_in_month(static::$calendar,$this->nextMonth['month'],$this->nextMonth['year']);
		$this->nextMonth['month-name'] = static::monthName($this->nextMonth['year'].'-'.$this->nextMonth['month']);
	}

	private function prevMonth()
	{
	
		$this->prevMonth['year']  = date('Y',strtotime('-1 month',strtotime($this->date)));
		$this->prevMonth['month'] = date('m',strtotime('-1 month',strtotime($this->date)));
		$this->prevMonth['daycount'] = cal_days_in_month(static::$calendar,$this->prevMonth['month'],$this->prevMonth['year']);
		$this->prevMonth['month-name'] = static::monthName($this->prevMonth['year'].'-'.$this->prevMonth['month']);
	}

    /**
     * This function is WordPress compatible
     * It uses date_i18n function where available
     */
	private static function monthName($date)
	{
        //WordPress compatible
        if( function_exists('date_i18n') ) {
		    return date_i18n( 'F',strtotime($date) );
        }
        return date( 'F',strtotime($date) );
	}

}