一个简单的php Calender(日历)

<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);

/**
 * 
 * 我的日历
 * date_default_timezone_set date mktime
 * @param int $year
 * @param int $month
 * @param string $timezone
 */
function myCalender($year = '', $month = '', $timezone = 'Asia/Shanghai')
{
 
 date_default_timezone_set ( $timezone );
 $year = abs ( intval ( $year ) );
 $month = abs ( intval ( $month ) );
 
 //是否是32位机
 if (is32())
 {
 if ($year < 1970 or $year >= 2038)
 {
 $year = date ( 'Y' );
 }
 } else
 {
 if ($year <= 0)
 {
 $year = date ( 'Y' );
 }
 
 }
 
 if ($month <= 0 or $month > 12)
 {
 $month = date ( 'm' );
 }
 
 //上一年
 $pretYear = $year - 1;
 //上一月
 $mpYear = $year;
 $preMonth = $month - 1;
 if ($preMonth <= 0)
 {
 $preMonth = 1;
 $mpYear = $pretYear;
 }
 
 //下一年
 $nextYear = $year + 1;
 //下一月
 $mnYear = $year;
 $nextMonth = $month + 1;
 if ($nextMonth > 12)
 {
 $nextMonth = 1;
 $mnYear = $nextYear;
 }
 
 //日历头
 $html = <<<HTML
<table width="500" border="1">
  <tr align="center">
    <td><a href="?y=$pretYear">上一年</a></td>
    <td><a href="?y=$mpYear&m=$preMonth">上一月</a></td>
     <td><a href="?">回到今天</a></td>
    <td><a href="?y=$mnYear&m=$nextMonth">下一月</a></td>
 <td><a href="?y=$nextYear">下一年</a></td>
  </tr>
  <tr align="center">
    <td colspan="5">{$year}年{$month}月</td>
  </tr>
  <tr>
  	<td colspan="5">
 <table width="100%" border="1">
 <tr align="center">
 <td style="background-color:#DAF0DD;">星期一</td>
 <td style="background-color:#DAF0DD;">星期二</td>
 <td style="background-color:#DAF0DD;">星期三</td>
 <td style="background-color:#DAF0DD;">星期四</td>
 <td style="background-color:#DAF0DD;">星期五</td>
 <td style="background-color:#F60;color:#fff;font-weight: bold;">星期六</td>
 <td style="background-color:#F60;color:#fff;font-weight: bold;">星期天</td>
 </tr>
HTML;
 
 $currentDay = date ( 'Y-m-j' );
 
 //当月最后一天
 $lastday = date ( 'j', mktime ( 0, 0, 0, $nextMonth, 0, $year ) );
 
 //循环输出天数
 $day = 1;
 $line = '';
 while ( $day <= $lastday )
 {
 $cday = $year . '-' . $month . '-' . $day;
 
 //当前星期几
 $nowWeek = date ( 'N', mktime ( 0, 0, 0, $month, $day, $year ) );
 
 if ($day == 1)
 {
 $line = '<tr align="center">';
 $line .= str_repeat ( '<td>&nbsp;</td>', $nowWeek - 1 );
 }
 
 if ($cday == $currentDay)
 {
 $style = 'style="color:red;"';
 } else
 {
 $style = '';
 }
 
 $line .= "<td $style>$day</td>";
 
 //一周结束
 if ($nowWeek == 7)
 {
 $line .= '</tr>';
 $html .= $line;
 $line = '<tr align="center">';
 }
 
 //全月结束
 if ($day == $lastday)
 {
 if ($nowWeek != 7)
 {
 $line .= str_repeat ( '<td>&nbsp;</td>', 7 - $nowWeek );
 }
 $line .= '</tr>';
 $html .= $line;
 
 break;
 }
 
 $day ++;
 }
 
 $html .= <<<HTML
 </table> 
 </td>
  </tr>
</table>
HTML;
 return $html;
}

/**
 * 
 * 检测是否是32位机
 */
function is32()
{
 $is32 = False;
 if (strtotime ( '2039-10-10' ) === False)
 {
 $is32 = True;
 }
 return $is32;
}
header("Content-type: text/html; charset=utf-8"); 
$y=$_REQUEST['y'];
$m=$_REQUEST['m'];
if(!$y){
 $y=2013;
}
echo myCalender($y);


?>

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