php 做个简单实用的日历

<?php 
class Calendar{
var $YEAR,$MONTH,$DAY;
var $COLOR_TODAY = "lightgray"; //当前日期的背景色

var $COLOR_THIS_MONTH = "lightgray"; //当前月的背景色

var $COLOR_THIS_YEAR = "lightgray"; //当前年的背景色

var $NUMS_YEAR = 1; //年份下拉表里可以显示的年份数目


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 $_MONTH=array( 
"01"=>"一月", 
"02"=>"二月", 
"03"=>"三月", 
"04"=>"四月", 
"05"=>"五月", 
"06"=>"六月", 
"07"=>"七月", 
"08"=>"八月", 
"09"=>"九月", 
"10"=>"十月", 
"11"=>"十一月", 
"12"=>"十二月"
);
function setYear($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; 
} 
//获得方法内指定的日期的星期数 0（表示星期天）到 6（表示星期六）

function getWeek($year,$month,$day){
        $week=date("w",mktime(0,0,0,$month,$day,$year));//获得星期

        return $week;//获得星期

        } 
//为$YEAR,$MONTH,$DAY赋值

function _env(){ 
    if(isset($_POST['month'])){//有指定月 

        $month=$_POST['month']; 
        }else{ 
            $month=date("m");//默认为本月 

        } 
        if(isset($_POST['year'])){//有指年 

            $year=$_POST['year']; 
        }else{ 
            $year=date("Y");//默认为本年 

        } 
    $this->setYear($year); 
    $this->setMonth($month); 
    $this->setDay(date("d")); 
    }
//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2011-10-31，星期一） 

    $fweek=$this->getWeek($this->YEAR,$this->MONTH,1);//获得此月第一天为星期几 

    //echo "<div style=\"align:center;margin:0;border:1 solid black;font:9pt\"><table border=1 solid align=center><tr><td colspan='7'>

    echo "<table border=1 solid align=center><tr><td colspan='7'> 
    <form action=$_SERVER[PHP_SELF] method=\"post\" style=\"margin:0\"> 
    月份：<select name=\"month\" onchange=\"this.form.submit();\">"; 
    for($ttmpa=1;$ttmpa<13;$ttmpa++){//打印12个月 

        $ttmpb=sprintf("%02d",$ttmpa); 
            if(strcmp($ttmpb,$this->MONTH)==0){ 
                $select="selected style=\"background-color:$this->COLOR_THIS_MONTH\""; 
            }else{ 
                $select=""; 
            }
            echo "<option value=\"$ttmpb\" $select>".$this->_MONTH[$ttmpb]."</option>"; 
        }
        echo "</select> 年份：<select name=\"year\" onchange=\"this.form.submit();\">";//打印年份

        for($ctmpa=$this->YEAR-$this->NUMS_YEAR;$ctmpa<=$this->YEAR+$this->NUMS_YEAR;$ctmpa++){ 
        if($ctmpa>2037){ 
                break; 
            } 
        if($ctmpa<1970){ 
            continue; 
            } 
        if(strcmp($ctmpa,$this->YEAR)==0){ 
            $select="selected style=\"background-color:$this->COLOR_THIS_YEAR\""; 
        }else{ 
            $select=""; 
            } 
            echo "<option value=\"$ctmpa\" $select>$ctmpa</option>"; 
            } 
            echo "</select> 
            </form></td></tr><tr>"; 
        for($Tmpa=0;$Tmpa<count($this->WEEK);$Tmpa++){//打印星期标头 

            echo "<td>".$this->WEEK[$Tmpa]."</td>"; 
        } 
            echo "</tr><tr>";
            for($Tmpc=0;$Tmpc<$fweek;$Tmpc++){ 
                    echo "<td></td>"; 
                }
          for($Tmpb=1;$Tmpb<=date("t",mktime(0,0,0,$this->MONTH,$this->DAY,$this->YEAR));$Tmpb++){//打印所有日期

            $Tmpb=sprintf("%02d",$Tmpb); 
            if((strcmp($Tmpb,$this->DAY)==0) && ($this->MONTH == date("m")) && ($this->YEAR == date("Y")) ){//获得当前日期，做标记

                $flag=" bgcolor='$this->COLOR_TODAY'";
            }else{ 
                $flag=" bgcolor='white'";
            }
            if((strcmp($this->getWeek($this->YEAR,$this->MONTH,$Tmpb),0)==0) && (1==$Tmpb)){ //第一天是星期日则不用加<tr>

                echo "<tr><td align=center $flag>$Tmpb</td>"; //星期日则换行，添加行首

            }else if(strcmp($this->getWeek($this->YEAR,$this->MONTH,$Tmpb),0)==0){ 
                echo "<tr><td align=center $flag>$Tmpb</td>"; //星期日则换行，添加行首

            }else if(strcmp($this->getWeek($this->YEAR,$this->MONTH,$Tmpb),6)==0){
                echo "<td align=center $flag>$Tmpb</td></tr>";//星期六为行尾

            }else{ 
                echo "<td align=center $flag>$Tmpb</td>"; 
            }
         
    }//for($Tmpb=1;$Tmpb<=date("t",mktime(0,0,0,$this->MONTH,$this->DAY,$this->YEAR));$Tmpb++)

    //最后一天是星期六不用再加</tr>

    if(strcmp($this->getWeek($this->YEAR,$this->MONTH,date("t",mktime(0,0,0,$this->MONTH,$this->DAY,$this->YEAR))),6)==0)
        echo "</table>";
    else
        echo "</tr></table>";
 }//out();

}//class Calendar

$d = new Calendar();
$d->out();
?>