php简单的日历程序代码

PHP提供了date()函数，该函数提供了丰富的日期处理功能。现在需要获得的数据有两个，第一个是当月的总天数；第二个是该月的第一天所在星期中的第几天，数字表示0（表示星期天）到6（表示星期六）。通过date()函数可以很容易获得上面的数据

<?php
$month = $_GET['m']?$_GET['m']:date(‘n’);
$year = $_GET['y']?$_GET['y']:date(‘Y’);
$start_week = date(‘w’,mktime(0,0,0,$month,1,$year));
$day_num = date(‘t’,mktime(0,0,0,$month,1,$year));
$end = false;
?>
<table>
<tr>
<td>星期日</td><td>星期一</td><td>星期二</td><td>星期三</td><td>星期四</td><td>星期五</td><td>星期六</td>
</tr>
<tr>
<?php
for($i = 0; $i<$start_week; $i++)
{
echo “<td></td>”;
}
$j=1;
while($j<=$day_num)
{
echo “<td>$j</td>”;
$week = ($start_week+$j-1)%7;
if($week ==6){
echo “nt</tr>n”;
if($j != $day_num)
echo “t<tr>ntt”;
else $end = true;
}
$j++;
}
while($week%7 != 6)
{
echo “<td></td>”;
$week++;
}
if(!$end)
echo “n</tr>”;
?>
</table>

高级一点类

<?php
class Calendar
{
    private $year;
    private $month;
    private $weeks  = array('日','一','二','三','四','五','六');
    
    function __construct($options = array()) {
        $this->year = date('Y');
        $this->month = date('m');
        
        $vars = get_class_vars(get_class($this));
        foreach ($options as $key=>$value) {
            if (array_key_exists($key, $vars)) {
                $this->$key = $value;
            }
        }
    }
    
    function display()
    {
        echo '<table class="calendar">';
        $this->showChangeDate();
        $this->showWeeks();
        $this->showDays($this->year,$this->month);
        echo '</table>';
    }
    
    private function showWeeks()
    {
        echo '<tr>';
        foreach($this->weeks as $title)
        {
            echo '<th>'.$title.'</th>';
        }
        echo '</tr>';
    }
    
    private function showDays($year, $month)
    {
        $firstDay = mktime(0, 0, 0, $month, 1, $year);
        $starDay = date('w', $firstDay);
        $days = date('t', $firstDay);
        echo '<tr>';
        for ($i=0; $i<$starDay; $i++) {
            echo '<td> </td>';
        }
        
        for ($j=1; $j<=$days; $j++) {
            $i++;
            if ($j == date('d')) {
                echo '<td class="today">'.$j.'</td>';
            } else {
                echo '<td>'.$j.'</td>';
            }
            if ($i % 7 == 0) {
                echo '</tr><tr>';
            }
        }
        
        echo '</tr>';
    }
    
    private function showChangeDate()
    {
        
        $url = basename($_SERVER['PHP_SELF']);
        
        echo '<tr>';
 echo '<td><a href="?'.$this->preYearUrl($this->year,$this->month).'">'.'<<'.'</a></td>';
 echo '<td><a href="?'.$this->preMonthUrl($this->year,$this->month).'">'.'<'.'</a></td>';
        echo '<td colspan="3"><form>';
        
        echo '<select name="year" onchange="window.location=''.$url.'?year='+this.options[selectedIndex].value+'&month='.$this->month.''">';
        for($ye=1970; $ye<=2038; $ye++) {
            $selected = ($ye == $this->year) ? 'selected' : '';
            echo '<option '.$selected.' value="'.$ye.'">'.$ye.'</option>';
        }
        echo '</select>';
        echo '<select name="month" onchange="window.location=''.$url.'?year='.$this->year.'&month='+this.options[selectedIndex].value+''">';
       
        
        for($mo=1; $mo<=12; $mo++) {
            $selected = ($mo == $this->month) ? 'selected' : '';
            echo '<option '.$selected.' value="'.$mo.'">'.$mo.'</option>';
        }
        echo '</select>';        
        echo '</form></td>';        
 echo '<td><a href="?'.$this->nextMonthUrl($this->year,$this->month).'">'.'>'.'</a></td>';
 echo '<td><a href="?'.$this->nextYearUrl($this->year,$this->month).'">'.'>>'.'</a></td>';        
        echo '</tr>';
    }
    
    private function preYearUrl($year,$month)
    {
        $year = ($this->year <= 1970) ? 1970 : $year - 1 ;
        
        return 'year='.$year.'&month='.$month;
    }
    
    private function nextYearUrl($year,$month)
    {
        $year = ($year >= 2038)? 2038 : $year + 1;
        
        return 'year='.$year.'&month='.$month;
    }
    
    private function preMonthUrl($year,$month)
    {
        if ($month == 1) {
            $month = 12;
            $year = ($year <= 1970) ? 1970 : $year - 1 ;
        } else {
            $month--;
        }        
        
        return 'year='.$year.'&month='.$month;
    }
    
    private function nextMonthUrl($year,$month)
    {
        if ($month == 12) {
            $month = 1;
            $year = ($year >= 2038) ? 2038 : $year + 1;
        }else{
            $month++;
        }
        return 'year='.$year.'&month='.$month;
    }
    
}

调用方法

<?php
$params = array();
if (isset($_GET['year']) && isset($_GET['month'])) {
    $params = array(
        'year' => $_GET['year'],
        'month' => $_GET['month'],
    );
}
$params['url']  = 'demo.php';
require_once 'calendar.class.php';
?>
<html>
    <head>
        <title>日历demo</title>
        <meta http-equiv="Content-Type" content="text/html" charset="UTF-8" />
        <style type="text/css">
            table.calendar {
                border: 1px solid #050;
            }
            .calendar th, .calendar td {
                width:30px;
                text-align:center;
            }            
            .calendar th {
                background-color:#050;
                color:#fff;
            }
            .today{
  color:#fff;
  background-color:#050;                
            }
        </style>
    </head>
    <body>
        <div style="align:center">
            <?php
                $cal = new Calendar($params);
                $cal->display();
            ?>    
        </div>
    </body>
</html>