php實現的日歷

日歷效果如下圖：

calendar.class.php

<?php  
class Calendar {  
        private $year; //當前的年  
        private $month; //當前的月  
        private $start_weekday; //當月的第一天對應的是周幾  
        private $days; //當前月一共多少天  
      
        function __construct(){  
            $this->year=isset($_GET["year"]) ? $_GET["year"] : date("Y");  
            $this->month=isset($_GET["month"]) ? $_GET["month"] : date("m");  
                  
            $this->start_weekday=date("w", mktime(0, 0, 0, $this->month, 1, $this->year));  
            $this->days=date("t", mktime(0, 0, 0, $this->month, 1, $this->year));  
        }  
      
        function out(){  
            echo '<table align="center">';  
            $this->chageDate("test.php");  
            $this->weeksList();  
            $this->daysList();  
            echo '</table>';  
        }  
      
        private function weeksList(){  
            $week=array('日','一','二','三','四','五','六');  
      
            echo '<tr>';  
            for($i=0; $i<count($week); $i++)  
                echo '<th class="fontb">'.$week[$i].'</th>';  
      
            echo '</tr>';  
        }  
      
        private function daysList(){  
            echo '<tr>';  
            //輸出空格(當前一月第一天前面要空出來)  
            for($j=0; $j<$this->start_weekday; $j++)  
                echo '<td> </td>';  
      
      
            for($k=1; $k<=$this->days; $k++){  
                $j++;  
                if($k==date('d'))  
                    echo '<td class="fontb">'.$k.'</td>';  
                else
                    echo '<td>'.$k.'</td>';  
      
                if($j%7==0)  
                    echo '</tr><tr>';  
                      
            }  
      
            //後面幾個空格  
            while($j%7!==0){  
                echo '<td> </td>';  
                $j++;  
            }  
      
            echo '</tr>';  
        }  
      
        private function prevYear($year, $month){  
            $year=$year-1;  
                  
            if($year < 1970)  
                $year = 1970;  
      
            return "year={$year}&month={$month}";     
        }  
      
      
        private function prevMonth($year, $month){  
            if($month == 1) {  
                $year = $year -1;  
              
                if($year < 1970)  
                    $year = 1970;  
      
                $month=12;  
            }else{  
                $month--;  
            }  
      
            return "year={$year}&month={$month}";     
        }  
      
      
        private function nextYear($year, $month){  
            $year = $year + 1;  
      
            if($year > 2038)  
                $year = 2038;  
      
            return "year={$year}&month={$month}";     
        }  
    // URL：http://www.bianceng.cn/webkf/PHP/201410/45945.htm
      
        private function nextMonth($year, $month){  
            if($month==12){  
                $year++;  
      
                if($year > 2100)  
                    $year=2100;  
      
                $month=1;  
            }else{  
                $month++;  
            }  
                  
      
            return "year={$year}&month={$month}";     
        }  
      
        private function chageDate($url=""){  
            echo '<tr>';  
            echo '<td><a href="?'.$this->prevYear($this->year, $this->month).'">'.'<<'.'</a></td>';  
            echo '<td><a href="?'.$this->prevMonth($this->year, $this->month).'">'.'<'.'</a></td>';  
            echo '<td colspan="3">';  
            echo '<form>';  
            echo '<select name="year" onchange="window.location=\''.$url.'?year=\'+this.options[selectedIndex].value+\'&month='.$this->month.'\'">'; 
            for($sy=1970; $sy <= 2100; $sy++){  
                $selected = ($sy==$this->year) ? "selected" : "";  
                echo '<option '.$selected.' value="'.$sy.'">'.$sy.'</option>';  
            }  
            echo '</select>';  
            echo '<select name="month"  onchange="window.location=\''.$url.'?year='.$this->year.'&month=\'+this.options[selectedIndex].value">';
            for($sm=1; $sm<=12; $sm++){  
                $selected1 = ($sm==$this->month) ? "selected" : "";  
                echo '<option '.$selected1.' value="'.$sm.'">'.$sm.'</option>';  
            }  
            echo '</select>';  
            echo '</form>';     
            echo '</td>';  
      
      
            echo '<td><a href="?'.$this->nextYear($this->year, $this->month).'">'.'>>'.'</a></td>';  
            echo '<td><a href="?'.$this->nextMonth($this->year, $this->month).'">'.'>'.'</a></td>';  
            echo '</tr>';  
        }  
      
    }  
?>

test.php