calendar2.html

<?php
/**
*@author  The-Di-Lab
*@email   thedilab@gmail.com
*@website http://www.the-di-lab.com
*@version 1.0
**/
class Calendar2 {   
	
	/**
     * Constructor
     */
	public function __construct(){		
		$this->naviHref = htmlentities($_SERVER['PHP_SELF']);
	}
	
	/********************* PROPERTY ********************/	
	public $cellContent ='';	
	protected $observers = array();
	
    private $dayLabels = array("Mon","Tue","Wed","Thu","Fri","Sat","Sun");
    private $currentYear=0;
    private $currentMonth=0;
    private $currentDay=0;
    private $currentDate=null;
    private $daysInMonth=0;
    private $sundayFirst=true;  
	private $naviHref= null;
    
    /********************* PUBLIC **********************/  
	/* @return void
	* @access public
	*/
	public function attachObserver($type,$observer) {
		$this->observers[$type][]=$observer;
	}
	
	/*
	*
	* @return void
	* @access public
	*/
	public function notifyObserver($type) {
		if(isset($this->observers[$type])){
			foreach($this->observers[$type] as $observer ){
				$observer->update($this);
			}
		}
	}
		
	public function getCurrentDate(){
		return $this->currentDate;
	}
	
    /**
    * Set week labels' order. 
    * When it is set to false, 
    * monday will be listed as the first day.
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              public
    * @param               boolean
    * @return              void
    */
	public function setSundayFirst($bool=true){
		$this->sundayFirst=$bool;
	}
	   
    /**
    * print out the calendar 
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              public
    * @param               string
    * @param               string
    * @param               array
    * @return              string
    */
	public function show($month=null,$year=null,$attributes=false){
		if(null==$year&&isset($_GET['year'])){
			$year = $_GET['year'];
		}else if(null==$year){
			$year = date("Y",time());	
		}			
		
		if(null==$month&&isset($_GET['month'])){
			$month = $_GET['month'];
		}else if(null==$month){
			$month = date("m",time());
		}					
		
		$this->currentYear=$year;
		$this->currentMonth=$month;
		$this->daysInMonth=$this->_daysInMonth($month,$year);	
		
		$content='<div id="calendar">'.
						'<div class="box">'.
						$this->_createNavi().
						'</div>'.
						'<div class="box-content">'.
								'<ul class="label">'.$this->_createLabels().'</ul>';	
								$content.='<div class="clear"></div>';		
								$content.='<ul class="dates">';		
								for($i=0;$i<$this->_weeksInMonth($month,$year);$i++){
									for($j=1;$j<=7;$j++){
										$content.=$this->_showDay($i*7+$j,$attributes);
									}
								}
								$content.='</ul>';
								$content.='<div class="clear"></div>';		
			$content.='</div>';		
		$content.='</div>';
		return $content;	
	}
	
    /********************* PRIVATE **********************/  
    /**
    * create the li element for ul
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @param               string
    * @param               array
    * @return              string
    */
	private function _showDay($cellNumber,$attributes=false){ 
		if($this->currentDay==0){
			//1 (for Monday) through 7 (for Sunday)
			$firstDayOfTheWeek = date('N',strtotime($this->currentYear.'-'.$this->currentMonth.'-01'));
			if($this->sundayFirst){
				if($firstDayOfTheWeek==7){
					$firstDayOfTheWeek=1;
				}else{
					$firstDayOfTheWeek++;
				}
			}			
			if(intval($cellNumber) == intval($firstDayOfTheWeek)){
				$this->currentDay=1;
			}
		}
		
	    if(($this->currentDay!=0)&&($this->currentDay<=$this->daysInMonth)){
	    	$this->currentDate = date('Y-m-d',strtotime($this->currentYear.'-'.$this->currentMonth.'-'.($this->currentDay)));
			$cellContent = $this->_createCellContent($attributes);
			$this->currentDay++;	
		}else{
			$this->currentDate =null;
			$cellContent=null;
		}
			
		
		return '<li id="li-'.$this->currentDate.'" class="'.($cellNumber%7==1?' start ':($cellNumber%7==0?' end ':' ')).
				($cellContent==null?'mask':'').'">'.$cellContent.'</li>';
	}
	
	/**
    * create navigation 
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @return              string
    */
	private function _createNavi(){
		$nextMonth = $this->currentMonth==12?1:intval($this->currentMonth)+1;
		$nextYear = $this->currentMonth==12?intval($this->currentYear)+1:$this->currentYear;
		
		$preMonth = $this->currentMonth==1?12:intval($this->currentMonth)-1;
		$preYear = $this->currentMonth==1?intval($this->currentYear)-1:$this->currentYear;
		
		return 
			'<div class="header">'.
				'<a class="prev" href="'.$this->naviHref.'?month='.sprintf('%02d',$preMonth).'&year='.$preYear.'">Prev</a>'.
					'<span class="title">'.date('Y M',strtotime($this->currentYear.'-'.$this->currentMonth.'-1')).'</span>'.
				'<a class="next" href="'.$this->naviHref.'?month='.sprintf("%02d", $nextMonth).'&year='.$nextYear.'">Next</a>'.
			'</div>';
	}
		
	/**
    * create calendar week labels
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @return              string
    */
	private function _createLabels(){		
		if($this->sundayFirst){
			$temp = $this->dayLabels[0];
			for($i=1;$i<sizeof($this->dayLabels);$i++){
				$tmp = $this->dayLabels[$i];
				$this->dayLabels[$i]=$temp;
				$temp=$tmp;
			}
			$this->dayLabels[0]=$temp;
		}
		
				
		$content='';
		foreach($this->dayLabels as $index=>$label){
			$content.='<li class="'.($label==6?'end title':'start title').' title">'.$label.'</li>';
		}
		
		return $content;
	}
	
    /**
    * create content for li element
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @param               array
    * @return              string
    */	
	private function _createCellContent($setting=false){
		$this->cellContent='';		
		
		$this->cellContent= $this->currentDay;
		
		//observer
		$this->notifyObserver('showCell');
		
		return $this->cellContent;
	}
	
    /**
    * calculate number of weeks in a particular month
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @param               number
    * @param               number
    * @return              number
    */
	private function _weeksInMonth($month=null,$year=null){
		if(null==($year))
			$year =  date("Y",time());	

		if(null==($month))
			$month = date("m",time());
						
		// find number of weeks in this month
		$daysInMonths = $this->_daysInMonth($month,$year);
		
		$numOfweeks = ($daysInMonths%7==0?0:1) + intval($daysInMonths/7);
		$monthEndingDay= date('N',strtotime($year.'-'.$month.'-'.$daysInMonths));
		$monthStartDay = date('N',strtotime($year.'-'.$month.'-01'));
		$monthEndingDay==7?$monthEndingDay=0:'';
		$monthStartDay==7?$monthStartDay=0:'';
		
		if($monthEndingDay<$monthStartDay){
			$numOfweeks++;
		}
		return $numOfweeks;
		
	}

	/**
    * calculate number of days in a particular month
    *
    * @author              The-Di-Lab <thedilab@gmail.com>
    * @access              private
    * @param               number
    * @param               number
    * @return              number
    */
	private function _daysInMonth($month=null,$year=null){
		if(null==($year))
			$year =  date("Y",time());	

		if(null==($month))
			$month = date("m",time());
			
		return date('t',strtotime($year.'-'.$month.'-01'));
	}
	
}