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<？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; $j++）echo "<td> </td>";for（$k=1; $k<=$this->days; $k++）{$j++;if（$k==date（"d"））echo "<td class="fontb">".$k."</td>";elseecho "<td>".$k."</td>";if（$j%7==0）echo "</tr><tr>";}//后面几个空格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={$month}"; }// URL：http://www.bianceng.cn/webkf/PHP/201410/45945.htmprivate function nextMonth（$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>";}}？>