计算月份中的月份，月份，年份，星期几和星期几

问题描述：

如何在PHP中使用给出的月份，年份，星期几和星期数来计算月份中的某天.
例如，如果我有2013年9月，并且星期几是星期五，星期数是2，我应该得到6.(2013年9月6日是第二个星期的星期五.)

How can I calculate the day of month in PHP with giving month, year, day of week and number of week.
Like, if I have September 2013 and day of week is Friday and number of week is 2, I should get 6. (9/6/2013 is Friday on the 2nd week.)

答

实现此目标的一种方法是使用相对格式"rel =" nofollow> strtotime() .

One way to achieve this is using relative formats for strtotime().

不幸的是，它不如:

strtotime('Friday of second week of September 2013');

为使您能像您所说的那样工作几周，您需要使用相对时间戳再次调用 strtotime().

In order for the weeks to work as you mentioned, you need to call strtotime() again with a relative timestamp.

$first_of_month_timestamp = strtotime('first day of September 2013');
$second_week_friday = strtotime('+1 week, Friday', $first_of_month_timestamp);
echo date('Y-m-d', $second_week_friday); // 2013-09-13

注意:由于本月的第一天从第一周开始，所以我相应地减少了一周.

Note: Since the first day of the month starts on week one, I've decremented the week accordingly.

计算月份中的月份，月份，年份，星期几和星期几

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