使用strtotime在一个月内获得第一个工作日 [英] Getting first weekday in a month with strtotime

问题描述

我想使用 strtotime 来确定给定月份的第一个星期三，但是当第一个星期三发生在

I'm trying to figure out the first wednesday of a given month using strtotime, but the "first wednesday" argument fails whenever the first wednesday happens to fall on the 1st.

有关此问题的更一般说明，请参阅以下代码和结果：

For a more general illustration of this problem, see the following code and result:

$mon = strtotime("December 2010 first monday");
$tue = strtotime("December 2010 first tuesday");
$wed = strtotime("December 2010 first wednesday");
$thu = strtotime("December 2010 first thursday");
$fri = strtotime("December 2010 first friday");
$sat = strtotime("December 2010 first saturday");
$sun = strtotime("December 2010 first sunday");

echo strftime("%m/%d/%y", $mon) . "<br>";
echo strftime("%m/%d/%y", $tue) . "<br>";
echo strftime("%m/%d/%y", $wed) . "<br>";
echo strftime("%m/%d/%y", $thu) . "<br>";
echo strftime("%m/%d/%y", $fri) . "<br>";
echo strftime("%m/%d/%y", $sat) . "<br>";
echo strftime("%m/%d/%y", $sun) . "<br>";

结果：

12/06/10
12/07/10
12/08/10
12/02/10
12/03/10
12/04/10
12/05/10

注意事项？本周的一天不应与本月1日相符？但是它从来没有，而是第八天的第二个例子总是返回。

Notice something? Shouldn't one day of the week coincide with the 1st of the month? But it never does, and instead the second instance of the day, on the 8th, is always returned.

任何人都有解释吗？

推荐答案

我没有任何解释，因为我也很眩目，但我设法找出你如何获得正确的日期，省略第一，像这样：

I don't have any explanation as I'm also dazzled, but I managed to find out how you get the correct date by omitting the "first", like so:

$ php -r 'echo date("m/d/y", strtotime("December 2010 Wednesday"));'
12/01/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Thursday"));'
12/02/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Friday"));'
12/03/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Saturday"));'
12/04/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Sunday"));'
12/05/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Monday"));'
12/06/10

$ php -r 'echo date("m/d/y", strtotime("December 2010 Tuesday"));'
12/07/10

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