日历

<?php
$year  = isset($_GET['year'])? $_GET['year']:date("Y");
$month = isset($_GET['month'])? $_GET['month']:date("m");
$day   = isset($_GET['day'])? $_GET['day']:date("d");
//当年当月的天数
$days       = date("t",mktime(0,0,0,$month,1,$year));
//获得当月的第一天是星期几
$startweek  = date("w",mktime(0,0,0,$month,1,$year));

for($i=0;$i<$startweek;$i++){
    echo "&nbsp;*&nbsp;";
}
for($j=0;$j<$days;$j++){
    $i++;
    echo "&nbsp;{$j}&nbsp;"

}

?>