01.<?php
02.$monthOptions = '';
03.$dayOptions = '';
04.$yearOptions = '';
05.
06.for($month=1; $month<=12; $month++)
07.{
08. $monthName = date("M", mktime(0, 0, 0, $month));
09. $monthOptions .= "<option value=\"{$month}\">{$monthName}</option>\n";
10.}
11.for($day=1; $day<=31; $day++)
12.{
13. $dayOptions .= "<option value=\"{$day}\">{$day}</option>\n";
14.}
15.for($year=2011; $year>=1950; $year--)
16.{
17. $yearOptions .= "<option value=\"{$year}\">{$year}</option>\n";
18.}
19.?>
20.<html>
21.<head>
22.<script type="text/javascript">
23.function updateDays()
24.{
25.
26. var monthSel = document.getElementById('month');
27. var daySel = document.getElementById('day');
28. var yearSel = document.getElementById('year');
29. var monthVal = monthSel.value;
30. var yearVal = yearSel.value;
31.
32.
33. var daysInMonth = 31;
34. if (monthVal==2)
35. {
36. daysInMonth = (yearVal%4==0 && (yearVal%100!=0 || yearVal%400==0)) ? 29 : 28;
37. }
38. else if (monthVal==4 || monthVal==6 || monthVal==9 || monthVal==11)
39. {
40. daysInMonth = 30;
41. }
42.
43.
44. if(daySel.options.length > daysInMonth)
45. {
46. daySel.options.length = daysInMonth;
47. }
48. while (daySel.options.length != daysInMonth)
49. {
50. daySel.options[daySel.length] = new Option(daySel.length+1, daySel.length+1, false);
51. }
52.
53. return;
54.}
55.
56.</script>
57.</head>
58.</html>
