PHP complete calendar class (CLASS)_PHP tutorial

class Calendar{
/*
* www.jb51.net修正版
*/
var $YEAR,$MONTH,$DAY;
var $WEEK=array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
var $_MONTH=array(
"01"=>"一月", 
"02"=>"二月", 
"03"=>"三月", 
"04"=>"四月", 
"05"=>"五月", 
"06"=>"六月", 
"07"=>"七月", 
"08"=>"八月", 
"09"=>"九月", 
"10"=>"十月", 
"11"=>"十一月", 
"12"=>"十二月" 
); 
//设置年份 
function setYear($year){ 
$this->YEAR=$year; 
} 
//获得年份 
function getYear(){ 
return $this->YEAR; 
} 
//设置月份 
function setMonth($month){ 
$this->MONTH=$month; 
} 
//获得月份 
function getMonth(){ 
return $this->MONTH; 
} 
//设置日期 
function setDay($day){ 
$this->DAY=$day; 
} 
//获得日期 
function getDay(){ 
return $this->DAY; 
} 
//打印日历 
function OUT(){ 
$this->_env(); 
$week=$this->getWeek($this->YEAR,$this->MONTH,$this->DAY);//获得日期为星期几 （例如今天为2003-07-18，星期五） 
$fweek=$this->getWeek($this->YEAR,$this->MONTH,1); //获得此月第一天为星期几 
echo "";
}
//Get the week number of the date specified in the method
function getWeek($year,$month,$day){
$week=date("w",mktime (0,0,0,$month,$day,$year));//Get the week
return $week;//Get the week
}
function _env(){
if( isset($_POST["month"]){ //Specified month
$month=$_POST["month"];
}else{
$month=date("m"); //The default is this month
}
if(isset($_POST["year"])){ //The year is specified
$year=$_POST["year"];
} else{
$year=date("Y"); //The default is this year
}
$this->setYear($year);
$this->setMonth($ month);
$this->setDay(date("d"));
}
}
$D=new Calendar;
$D->OUT();
?>