由两个文件组成：

第一个test.php

<style>    table {        border:1px solid #050;    }    .fontb {        color:white;        background:blue;    }        th {        width:30px;    }    td,th {        height:30px;        text-align:center;            }    form {        margin:0px;        padding:0px;    }</style><?php    include "calendar.class.php";    $calendar=new Calendar;    $calendar->out();

第二个日历类：calendar.class.php

<?phpclass Calendar {        PRivate $year; //当前的年        private $month; //当前的月        private $start_weekday; //当月的第一天对应的是周几        private $days; //当前月一共多少天        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[$i].'</th>';            echo '</tr>';        }        private function daysList(){            echo '<tr>';            //输出空格(当前一月第一天前面要空出来)            for($j=0; $j<$this->start_weekday; $j++)                echo '<td>&nbsp;</td>';            for($k=1; $k<=$this->days; $k++){                $j++;                if($k==date('d'))                    echo '<td class="fontb">'.$k.'</td>';                else                    echo '<td>'.$k.'</td>';                if($j%7==0)                    echo '</tr><tr>';                            }            //后面几个空格            while($j%7!==0){                echo '<td>&nbsp;</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={$month}";            }        private function nextMonth($year, $month){            if($month==12){                $year++;                if($year > 2038)                    $year=2038;                $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 <= 2038; $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>';        }    }

效果：