这篇文章主要介绍php计算一年有多少周，获取每周开始日期和结束日期，有需要的朋友可以参考一下。

最近接了一个项目，其中有一需求是用php获取一年有几周以及每周开始日期和接触日期。在网上找些资料没有合适的，于是自己做了一份，下面通过两种方式实现PHP获取一年有几周以及每周开始日期和结束日期。

代码一：

1. <?php
2. header("Content-type:text/html;charset=utf-8");
3. date_default_timezone_set("Asia/Shanghai");
4. $year = (int)$_GET['year'];
5. $week = (int)$_GET['week'];
6. $weeks = date("W", mktime(0, 0, 0, 12, 28, $year));
7. echo $year . '年一共有' . $weeks . '周<br />';
8. if ($week > $weeks || $week <= 0)
9. {
10. $week = 1;
11. }
12. if ($week < 10)
13. {
14. $week = '0' . $week;
15. }
16. $timestamp['start'] = strtotime($year . 'W' . $week);
17. $timestamp['end'] = strtotime('+1 week -1 day', $timestamp['start']);
18. echo $year . '年第' . $week . '周开始时间戳：' . $timestamp['start'] . '<br />';
19. echo $year . '年第' . $week . '周结束时间戳：' . $timestamp['end'] . '<br />';
20. echo $year . '年第' . $week . '周开始日期：' . date("Y-m-d", $timestamp['start']) . '<br />';
21. echo $year . '年第' . $week . '周结束日期：' . date("Y-m-d", $timestamp['end']);
22. ?>

代码二：

1. <?php
2. header("Content-type:text/html;charset=utf-8");
3. function getIsoWeeksInYear($year)
4. {
5. $date = new DateTime;
6. $date->setISODate($year, 53);
7. return ($date->format("W") === "53" ? 53 : 52);
8. }
9. function weekday($custom_date)
10. {
11. $week_start = date('d-m-Y', strtotime('this week monday', $custom_date));
12. $week_end = date('d-m-Y', strtotime('this week sunday', $custom_date));
13. $week_array[0] = $week_start;
14. $week_array[1] = $week_end;
15. return $week_array;
16. }
17. echo '<br> Weeks in 2013<br>' . getIsoWeeksInYear(2013);
18. $weekday = weekday(strtotime(date('d-m-Y', strtotime('5-8-2013'))));
19. echo '<br> 10-8-2013';
20. echo '<br>Start: ' . $weekday[0];
21. echo '<br>End: ' . $weekday[1];
22. ?>

以上本文的全部内容，希望对大家学习PHP获取一年有几周以及每周开始日期和结束日期，有所帮助。