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<?php  /*  * php 输出日历程序  */ header("Content-type: text/html;charset=utf-8");  $year=(!isset($_GET['year'])||$_GET['year']=="")?date("Y"):$_GET['year'];  $month=(!isset($_GET['month'])||$_GET['month']=="")?date("n"):$_GET['month'];  $curUrl=$_SERVER['PHP_SELF'];     if($year<1971){    echo "出错!";    echo "<BR>";    echo "<a href=",$curUrl,">Back</a>";    exit();  }  ?>  <table width="200" border="1" cellspacing="0" cellpadding="0" bordercolor="#E7E7E7" style="font-size:12px;" align="center">  <tr align="center"><td colspan="2">  <?php  //<-------当月份超出1至12时的处理;开始------->  if($month<1){    $month=12;    $year-=1;  }  if($month>12){    $month=1;    $year+=1;  }  //<-------当月份超出1至12时的处理;结束------->  //<---------上一年,下一年,上月,下月的连接处理及输出;开始--------->  echo "<a href=",$curUrl,"?year=".($year-1)."&month=".$month."><<</a>年<a href=",$curUrl,"?year=".($year+1)."&month=".$month.">>></a>";  ?>  </td><td colspan="3"><?php echo $year."年".$month."月";?>  </td><td colspan="2">  <?php  echo "<a href=",$curUrl,"?month=".($month-1)."&year=".$year."><<</a>月<a href=",$curUrl,"?month=".($month+1)."&year=".$year.">>></a>";  //<--------上一年,下一年,上月,下月的连接处理及输出;结束--------->  ?></td></tr>  <tr align=center><td><font color="red">日</font></td><td>一</td><td>二</td><td>三</td><td>四</td><td>五</td><td>六</td></tr><tr>  <?php  $d=date("d");  $FirstDay=date("w",mktime(0,0,0,$month,1,$year));//取得任何一个月的一号是星期几,用于计算一号是由表格的第几格开始  $bgtoday=date("d");  function font_color($month,$today,$year){//用于计算星期天的字体颜色    $sunday=date("w",mktime(0,0,0,$month,$today,$year));    if($sunday=="0"){      $FontColor="red";    }else{      $FontColor="black";    }    return $FontColor;  }  function bgcolor($month,$bgtoday,$today_i,$year){//用于计算当日的背景颜色    $show_today=date("d",mktime(0,0,0,$month,$today_i,$year));    $sys_today=date("d",mktime(0,0,0,$month,$bgtoday,$year));    if($show_today==$sys_today){    $bgcolor="bgcolor=#6699FF";    }else{    $bgcolor="";    }    return $bgcolor;  }  function font_style($month,$today,$year){//用于计算星期天的字体风格    $sunday=date("w",mktime(0,0,0,$month,$today,$year));    if($sunday=="0"){      $FontStyle="<strong>";    }else{      $FontStyle="";    }    return $FontStyle;  }  for($i=0;$i<=$FirstDay;$i++){//此for用于输出某个月的一号位置    for($i;$i<$FirstDay;$i++){      echo "<td align=center> </td>\n";    }    if($i==$FirstDay){      echo "<td align=center ".bgcolor($month,$bgtoday,1,$year)."><font color=".font_color($month,1,$year).">".font_style($month,1,$year)."1</font></td>\n";      if($FirstDay==6){//判断1号是否星期六        echo "</tr>";      }    }  }  $countMonth=date("t",mktime(0,0,0,$month,1,$year));//某月的总天数  for($i=2;$i<=$countMonth;$i++){//输出由1号定位,随后2号直至月尾的所有号数    echo "<td align=center ".bgcolor($month,$bgtoday,$i,$year)."><font color=".font_color($month,$i,$year).">".font_style($month,$i,$year)."$i</font></td>\n";    if(date("w",mktime(0,0,0,$month,$i,$year))==6){//判断该日是否星期六      echo "</tr>\n";    }  }  ?>  </table>