php根据年份和周数获取日期的方法

2. function getWeekDate($year,$weeknum){
3. $firstdayofyear=mktime(0,0,0,1,1,$year);
4. $firstweekday=date('N',$firstdayofyear);
5. $firstweenum=date('W',$firstdayofyear);
6. if($firstweenum==1){
7. $day=(1-($firstweekday-1))+7*($weeknum-1);
8. $startdate=date('Y-m-d',mktime(0,0,0,1,$day,$year));
9. $enddate=date('Y-m-d',mktime(0,0,0,1,$day+6,$year));
10. }else{
11. $day=(9-$firstweekday)+7*($weeknum-1);
12. $startdate=date('Y-m-d',mktime(0,0,0,1,$day,$year));
13. $enddate=date('Y-m-d',mktime(0,0,0,1,$day+6,$year));
14. }
15. return array($startdate,$enddate);
16. }
17. ?>

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