<?php
////判断$Year和$Month是否为空,如果为空就获取系统当前日期,否则用$_GET获取
$Year = empty($_GET[\'Year\']) ? date(\"Y\"): $_GET[\"Year\"];
$Month = empty($_GET[\'Month\']) ? date(\"m\"): $_GET[\"Month\"];
////获取当前日期////
$Today = date(\"Ymj\");
////初始化日期数组////
$Maxday = array(\"1\",\"2\",\"3\",\"4\",\"5\",\"6\",\"7\",\"8\",\"9\",\"10\",\"11\",\"12\",\"13\",\"14\",\"15\",\"16\",\"17\",\"18\",\"19\",\"20\",
\"21\",\"22\",\"23\",\"24\",\"25\",\"26\",\"27\",\"28\",\"29\",\"30\",\"31\");
$Maxday_count = count($Maxday);
////初始化星期数组////
$Weekday = array(\"<font color=\'red\'>Sun</font>\",\"Mon\",\"Tue\",\"Wed\",\"Thu\",\"Fri\",\"<font color=\'red\'>Sat</font>\");
$Weekday_count = count($Weekday);
$daynum = 0;
$space = \"<td> </td>\";
$col = 0;
////打印表格头部////
?>
<form action=\"calendar.php\" method=\"post\" name=\"linked\">
<table><tr><td colspan=3 align=center><a href=\"?Year=<?php if($Year-1 > 1900)echo $Year-1;else echo $Year;?>&Month=<?php echo $Month?>\" onClick=\"javascript:document.linked.submit();\" name=\"Year\"><<</a> <?php echo $Year?> <a href=\"?Year=<?php if($Year+1 <2999) echo $Year+1;else echo $Year;?>&Month=<?php echo $Month?>\" onClick=\"javascript:document.linked.submit();\" name=\"Year\">>></a></td>
<td> </td><td colspan=3 align=center><a href=\"?Year=<?php echo $Year?>&Month=<?php if($Month-1 >0) if($Month-1 < 10)echo \"0\".($Month-1); else echo $Month-1; else echo $Month;?>\" onClick=\"javascript:document.linked.submit();\" name=\"Month\"><<</a> <?php echo $Month;?> <a href=\"?Year=<?php echo $Year?>&Month=<?php if($Month+1 <13) if($Month+1 <10) echo \"0\".($Month+1);else echo ($Month+1); else echo $Month;?>\" onClick=\"javascript:document.linked.submit();\" name=\"Month\">>></a></td></tr><tr><td colspan=\"8\"></td></tr><tr>
<?php
////打印星期列表////
while(list(,$Weekvalue) = each($Weekday))
 echo \"<td align=center> \".$Weekvalue.\" </td>\";
echo \"</tr>\";
////打印日期列表////
//当月份为4,6,9,11的时候,从数组末尾删除一个值,也就是删除31这个值.
if($Month == 4 or $Month == 6 or $Month == 9 or $Month == 11)
{
 array_pop($Maxday);
 $Maxday_count--;
}
//先判断月份是否为2月,如果是的话再判断年份是否为闰年,如果是的话就从数组尾部移除2个值,否则就移除3个值.
if($Month == 2)
{
 if($Year % 4 == 0)
 {
 array_pop($Maxday);
 array_pop($Maxday);
 $Maxday_count-=2;
 }
 else
 {
 array_pop($Maxday);
 array_pop($Maxday);
 array_pop($Maxday);
 $Maxday_count-=3;
 }
}
////打印日期////
while($daynum < $Maxday_count)
{
echo \"<tr>\";
 while(list($colnum,$Dayvalue) = each($Maxday))
 {
  //判断当前日期为一星期中的哪一天
  $DayWeek = date(\"w\",strtotime($Year.\"-\".$Month.\"-\".$Dayvalue));
  //当当前日期处于第1个,也就是每个月的第1天的时候,在它前面补上相应的空格子
  if($Dayvalue == 1)
   for($i=0;$i<$DayWeek;$i++)
   echo $space;//打印每个月空出的几个格子
  $daynum++;
  //当打印日期的时候与当前日期字符串进行比较,如果相等就将字体标为红色.
  if($Year.$Month.$Dayvalue == $Today)
  {
   $u1 = \"<b><u>\";
   $u2 = \"</b></u>\";
  }
  else
  {
   $u1 = \"\";
   $u2 = \"\";
  }
  if($DayWeek == 0 or $DayWeek == 6)
   $color = \"red\";
  else
   $color = \"black\";
  echo \"<td align=center><font color=\".$color.\"> \".$u1.$Dayvalue.$u2.\" </font></td>\";
  //用本周第几天这个值加1,如果是7的倍数就换行退出此轮循环(换行打印)
  if(($DayWeek+1) % 7 == 0)
  {
   $col++;
   break;
  }
 }
echo \"</tr>\";
}
?>