根据出生日期计算年龄（考虑到闰年的情况）

主要考虑到闰年的情况，如果有人出生在2.29，那么不是闰年则过了2.28将算上一岁

1. function age($birth) {
2. $age = array();
3. //$now = date('Ymd');
4. $now = "20110228";
5. //分解当前日期为年月日
6. $nowyear = (int) ($now / 10000);
7. $nowmonth = (int) (($now % 10000) / 100);
8. $nowday = $now % 100;
11. //分解出生日期为年月日
12. $birthyear = (int) ($birth / 10000);
13. $birthmonth = (int) (($birth % 10000) / 100);
14. $birthday = $birth % 100;
16. $year = $nowyear - $birthyear;
17. if ($birthmonth>$nowmonth){
18. $year--;
19. }else if($birthmonth==$nowmonth){
20. if($birthday==29&&$birthmonth=2){
21. /* if($nowyear>3200||($nowyear%3200==0&&$nowyear%172800==0)){
22. if($birthday>$nowday){
23. $year--;
24. }
25. }else if($nowyear==3200){
26. if (($birthday>$nowday)&&$nowday!=28){
27. $year--;
28. }
29. }else */
30. if ($nowyear%400==0||(($nowyear%4==0)&&($nowyear%100!=0))){
31. if($birthday>$nowday){
32. $year--;
33. }
34. }
35. }
36. }
38. return $year;
43. }

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