分享如何用PHP制作日历（附代码）

<?php
 require_once &#39;calendar.php&#39;;
 $util = new Calendar();
 $years = array(2012, 2013, 2014, 2015, 2016);//年份选择自定义
 $months = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);//月份数组
 //获取post的年份数据
 if(empty($_POST[&#39;ddlYear&#39;])) {
  $year = date(&#39;Y&#39;);
 }else {
  $year = $_POST[&#39;ddlYear&#39;];
 }
 //获取post的月份数据
 if(empty($_POST[&#39;ddlMonth&#39;])) {
  $month = date(&#39;n&#39;);
 }else {
  $month = $_POST[&#39;ddlMonth&#39;];
 }

 $calendar = $util->threshold($year, $month);//获取各个边界值
 $caculate = $util->caculate($calendar);//计算日历的天数与样式
 $draws = $util->draw($caculate);//画表格，设置table中的tr与td
?>

<p style="padding:20px">
  <select name="ddlYear">
  <?php foreach($years as $data) {?>
   <option value="<?php echo $data?>" <?php if($year == $data) echo &#39;selected="selected"&#39;?>><?php echo $data?></option>
  <?php }?>
  </select>
  <select name="ddlMonth">
  <?php foreach($months as $data) {?>
   <option value="<?php echo $data?>" <?php if($month == $data) echo &#39;selected="selected"&#39;?>><?php echo $data?></option>
  <?php }?>
  </select>
  <input type="submit" value="修改"/>
 </p>
 <table width="100%" cellspacing="0" class="table_calendar">
  <thead class="f14">
    <tr>
     <td width="16%">日</td>
     <td width="14%">一</td>
     <td width="14%">二</td>
     <td width="14%">三</td>
     <td width="14%">四</td>
     <td width="14%">五</td>
     <td width="14%">六</td>
    </tr>
  </thead>
  <tbody class="f14">
   <?php foreach($draws as $draw) {?>
    <tr>
    <?php foreach($draw as $date) {?>
     <td class="<?php echo $date[&#39;tdclass&#39;]?>">
      <p class="<?php echo $date[&#39;pclass&#39;]?>"><?php echo $date[&#39;day&#39;]?></p>
     </td>
    <?php }?> 
    </tr>
   <?php }?>
  </tbody>
 </table>

/**
  * @deprecated 生成日历的各个边界值
  * @param string $year
  * @param string $month
  * @return array
  */
 function threshold($year, $month) {
  $firstDay = mktime(0, 0, 0, $month, 1, $year);
  $lastDay = strtotime('+1 month -1 day', $firstDay);
  //取得天数 
  $days = date("t", $firstDay);
  //取得第一天是星期几
  $firstDayOfWeek = date("N", $firstDay);
  //获得最后一天是星期几
  $lastDayOfWeek = date('N', $lastDay);
  
  //上一个月最后一天
  $lastMonthDate = strtotime('-1 day', $firstDay);
  $lastMonthOfLastDay = date('d', $lastMonthDate);
  //下一个月第一天
  $nextMonthDate = strtotime('+1 day', $lastDay);
  $nextMonthOfFirstDay = strtotime('+1 day', $lastDay);
  
  //日历的第一个日期
  if($firstDayOfWeek == 7)
   $firstDate = $firstDay;
  else 
   $firstDate = strtotime('-'. $firstDayOfWeek .' day', $firstDay);
  //日历的最后一个日期
  if($lastDayOfWeek == 6)
   $lastDate = $lastDay;
  elseif($lastDayOfWeek == 7) 
   $lastDate = strtotime('+6 day', $lastDay);
  else
   $lastDate = strtotime('+'.(6-$lastDayOfWeek).' day', $lastDay);
  
  return array(
    'days' => $days, 
    'firstDayOfWeek' => $firstDayOfWeek, 
    'lastDayOfWeek' => $lastDayOfWeek,
    'lastMonthOfLastDay' => $lastMonthOfLastDay,
    'firstDate' => $firstDate,
    'lastDate' => $lastDate,
    'year' => $year,
    'month' => $month
  );
 }

/**
  * @author Pwstrick
　　　* @param array $calendar 通过threshold方法计算后的数据
  * @deprecated 计算日历的天数与样式
  */
 function caculate($calendar) {
  $days = $calendar['days'];
  $firstDayOfWeek = $calendar['firstDayOfWeek'];//本月第一天的星期
  $lastDayOfWeek = $calendar['lastDayOfWeek'];//本月最后一天的星期
  $lastMonthOfLastDay = $calendar['lastMonthOfLastDay'];//上个月的最后一天
  $year = $calendar['year'];
  $month = $calendar['month'];
  
  $dates = array();
  if($firstDayOfWeek != 7) {
   $lastDays = array();
   $current = $lastMonthOfLastDay;//上个月的最后一天
   for ($i = 0; $i < $firstDayOfWeek; $i++) {
    array_push($lastDays, $current);//添加上一个月的日期天数
    $current--;
   }
   $lastDays = array_reverse($lastDays);//反序
   foreach ($lastDays as $index => $day) {
    array_push($dates, array(&#39;day&#39; => $day, &#39;tdclass&#39; => ($index ==0 ?&#39;rest&#39;:&#39;&#39;), &#39;pclass&#39; => &#39;outter&#39;));
   }
  }
  
  //本月日历信息
  for ($i = 1; $i <= $days; $i++) {
   $isRest = $this->_checkIsRest($year, $month, $i);
   //判断是否是休息天
   array_push($dates, array(&#39;day&#39; => $i, &#39;tdclass&#39; => ($isRest ?&#39;rest&#39;:&#39;&#39;), &#39;pclass&#39; => &#39;&#39;));
  }
  
  //下月日历信息
  if($lastDayOfWeek == 7) {//最后一天是星期日
   $length = 6;
  }
  elseif($lastDayOfWeek == 6) {//最后一天是星期六
   $length = 0;
  }else {
   $length = 6 - $lastDayOfWeek;
  }
  for ($i = 1; $i <= $length; $i++) {
   array_push($dates, array(&#39;day&#39; => $i, &#39;tdclass&#39; => ($i==$length ?&#39;rest&#39;:&#39;&#39;), &#39;pclass&#39; => &#39;outter&#39;));
  }
  
  return $dates;
 }

　/**
  * @author Pwstrick
  * @param array $caculate 通过caculate方法计算后的数据
  * @deprecated 画表格，设置table中的tr与td
  */
 function draw($caculate) {
  $tr = array();
  $length = count($caculate);
  $result = array();
  foreach ($caculate as $index => $date) {
   if($index % 7 == 0) {//第一列
    $tr = array($date);
   }elseif($index % 7 == 6 || $index == ($length-1)) {
    array_push($tr, $date);
    array_push($result, $tr);//添加到返回的数据中
    $tr = array();//清空数组列表
   }else {
    array_push($tr, $date);
   }
  }
  return $result;
 }