HP实现计算一年多少个星期，返回一个星期的开始时间和结束时间（可选返回时间戳或日期）

1. function getWeekStartAndEnd ($year,$week=1) {
2. header("Content-type:text/html;charset=utf-8");
3. date_default_timezone_set("Asia/Shanghai");
4. $year = (int)$year;
5. $week = (int)$week;
6. //按给定的年份计算本年周总数
7. $date = new DateTime;
8. $date->setISODate($year, 53);
9. $weeks = max($date->format("W"),52);
10. //如果给定的周数大于周总数或小于等于0
11. if($week>$weeks || $week return false;
12. }
13. //如果周数小于10
14. if($week $week = '0'.$week;
15. }
16. //当周起止时间戳
17. $timestamp['start'] = strtotime($year.'W'.$week);
18. $timestamp['end'] = strtotime('+1 week -1 day',$timestamp['start']);
19. //当周起止日期
20. $timeymd['start'] = date("Y-m-d",$timestamp['start']);
21. $timeymd['end'] = date("Y-m-d",$timestamp['end']);
22. //返回起始时间戳
23. return $timestamp;
24. //返回日期形式
25. //return $timeymd;
26. }

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可选, 一个星期, 多少个