日历

<?php
/**
 * php日历代码
 */
date_default_timezone_set('PRC');
function calendar(){ 
    if(isset($_GET['ym']) && $_GET['ym']){ 
        $year = substr($_GET['ym'],0,4); 
        $month = substr($_GET['ym'],4,(strlen($_GET['ym'])-4));

        if($month>12){ 
            $year += floor($month/12); 
            $month = $month % 12; 
        } 
        if($year > 2030) $year = 2030; 
        if($year < 1980) $year = 1980; 
    }
    
    $year = isset($year) ? $year : date('Y'); 
    $month = isset($month) ? $month : date('n');

    if($year==date('Y') && $month==date('n')) $today = date('j');

    if($month-1 == 0) 
        $prevmonth = ($year - 1)."12"; 
    else $prevmonth = $year.($month - 1);

    if($month+1 == 13) 
        $nextmonth = ($year+1)."1"; 
    else $nextmonth = $year.($month+1);

    $prevyear = ($year - 1).$month; 
    $nextyear = ($year + 1).$month;
echo '<table width="400" border="0" cellpadding="2" cellspacing="2">
  <tr> 
    <td ><a href="?ym='.$prevyear.'"><<</a></td> 
    <td ><a href="?ym='.$prevmonth.'"><</a></td> 
    <td colspan="3" >'.$year.' - '.$month.'</td> 
    <td ><a href="?ym='.$nextmonth.'">></a></td> 
    <td ><a href="?ym='.$nextyear.'">>></a></td> 
  </tr> 
  <tr> 
    <td width="27" >日</td> 
    <td width="27" >一</td> 
    <td width="27" >二</td> 
    <td width="27" >三</td> 
    <td width="27" >四</td> 
    <td width="27" >五</td> 
    <td width="27" >六</td> 
  </tr>';
 
    $nowtime = mktime(0,0,0,$month,1,$year);                    //当月１号转为秒 
    $daysofmonth = date('t',$nowtime);                            //当月天数
    $weekofbeginday = date('w',$nowtime);                        //当月第一天是星期几 
    $weekofendday = date('w',mktime(0,0,0,$month+1,0,$year));    //当月最后一天是星期几 
    $daysofprevmonth = date('t',mktime(0,0,0,$month,0,$year));    //上个月天数
    $count = 1;//计数
    // echo $weekofbeginday;
    //列出上月后几天 
    if($weekofbeginday>0){
        for($i = 1 ; $i <= $weekofbeginday ; $i++){ 
            echo "<td style='background:#ccc'>".($daysofprevmonth-$weekofbeginday+$i)."</td>"; 
            $count++; 
        } 
    }else{
        for($i = ($daysofprevmonth-7 -$weekofbeginday)+1 ; $i <= $daysofprevmonth; $i++){ 
            echo "<td style='background:#ccc'>".$i."</td>";
            if($count%7==0) echo "</tr><tr>"; 
            $count++; 
        } 
    }
   
    //当月全部 
    for($i = 1 ; $i <= $daysofmonth ; $i++) 
        { 
            $css = ($count%7==0 || $count%7==1)?"weekday":"normalday"; 
            if($i == @$today) $css .= "today";
            if(date('d')==$i && date('m')==$month){
                 echo "<td style='background:red'>".$i."</td>"; 
            }else{
                echo "<td>".$i."</td>";
            }            
            if($count%7==0) echo "</tr><tr>"; 
            $count++; 
        } 
    //下月前几天
    $l = (43-$count);
    // for ($i = 1;$i <= 6-$weekofendday;$i++){
    for ($i = 1;$i <= $l;$i++){
        if($count>42){
            break;
        }
        
        echo "<td {$css} style='background:#ccc'>".$i."</td>"; 
        if($count%7==0) echo "</tr><tr>"; 
        $count++; 
    }
    echo '<td colspan="7"><a href="?y='.date('Y').'&m='.date('m').'&d='.date('d').'">今日</a></td></tr> </table>';
} 
?>

HTML

<!DOCTYPE html> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>calendar</title>
<style type="text/css"> 
<!-- /* table细线表格 */ 
    table { 
        border-collapse:collapse;     /* 关键属性：合并表格内外边框(其实表格边框有2px，外面1px，里面还有1px哦) */ 
        border:solid #999;             /* 设置边框属性；样式(solid=实线)、颜色(#999=灰) */ 
        border-width:1px 0 0 1px;     /* 设置边框状粗细：上 右 下 左 = 对应：1px 0 0 1px */ 
    } 
    table th,table td {border:solid #999;border-width:0 1px 1px 0;padding:2px;} 
    table td {text-align:center;} 
--> 
</style> 
</head>
<body> 
<?php calendar();?> 
</body> 
</html>