PHP日历

<?
function calendar($date)
         {
         //If no parameter is passed use the current date.
         if($date == null)
            $date = getDate();
            
         $day = $date["mday"];
         $month = $date["mon"];
         $month_name = $date["month"];
         $year = $date["year"];
         
         $this_month = getDate(mktime(0, 0, 0, $month, 1, $year));
         $next_month = getDate(mktime(0, 0, 0, $month + 1, 1, $year));
         
         //Find out when this month starts and ends.         
         $first_week_day = $this_month["wday"];
         $days_in_this_month = round(($next_month[0] - $this_month[0]) / (60 * 60 * 24));
                          
         $calendar_html = "<table style=\"background-color:666699; color:ffffff;\">";
         
         $calendar_html .= "<tr><td colspan=\"7\" align=\"center\" style=\"background-color:9999cc; color:000000;\">" . 
                           $month_name . " " . $year . "</td></tr>";
                           
         $calendar_html .= "<tr>";
          
         //Fill the first week of the month with the appropriate number of blanks.       
         for($week_day = 0; $week_day < $first_week_day; $week_day++)
            {
            $calendar_html .= "<td style=\"background-color:9999cc; color:000000;\"> </td>";   
            }
            
         $week_day = $first_week_day;
         for($day_counter = 1; $day_counter <= $days_in_this_month; $day_counter++)
            {
            $week_day %= 7;
            
            if($week_day == 0)
               $calendar_html .= "</tr><tr>";
            
            //Do something different for the current day.
            if($day == $day_counter)   
               $calendar_html .= "<td align=\"center\"><b>" . $day_counter . "</b></td>";
            else
               $calendar_html .= "<td align=\"center\" style=\"background-color:9999cc; color:000000;\">&nbsp;" .
                                 $day_counter . " </td>";
            
            $week_day++;
            }
            
         $calendar_html .= "</tr>";
         $calendar_html .= "</table>";
                   
         return($calendar_html);
         }
?>