将DateInterval格式设置为ISO8601 [英] Format DateInterval as ISO8601

问题描述

我目前正在处理一个php项目，需要将DateInterval格式化为ISO8601（类似这样）：

  P5D 
  

此格式可用于创建DateTime和DateInterval对象，但我找不到解决方法将DateInterval格式化为这种格式。有没有？如果不是，那么什么可能是轻量级的解决方案呢？

解决方案

好吧，如果您在查看格式规范时构造一个：

Y年

M个月

D天

W周。

H小时

M分钟 p>

S秒

然后看看您需要使用什么（ href = http://php.net/manual/en/dateinterval.format.php rel = nofollow> http://php.net/manual/en/dateinterval.format.php ），似乎您应该做的是：

  $ dateInterval = new DateInterval（/ *不管* /）; 
 $ format = $ dateInterval-> format（ P％yY％mM％dD％hH％iM％sS）; 
 // P0Y0M5D0H0M0S 
 //现在，我们需要删除所有为零的东西，但请确保不要删除
 //类似10D或20D 
 $ format = str_replace （[[ M0S， H0M， D0H， M0D， Y0M， P0Y]，[ M， H， D， M， Y0M， P ]，$ format）; 
 echo $ format; 
 // P0M5D 
  

现在，我做不同的一件事就是我总是包括月份，即使它是0。原因是分钟和月两者都由 M 表示-如果我们始终包括月份，那么如果有分钟，我们就知道是分钟。否则，我们必须做一堆逻辑来看看是否需要将 P 更改为 PT ，以便知道在这种情况下，a M 代表分钟。

例如：

  // 3个月
 new DateInterval（ P3M）; 
 // 3分钟
 new DateInterval（ PT3M））; 
  

但我们却这样做：

  // 3个月
新的DateInterval（ P3M）; 
 // 3分钟
 new DateInterval（ P0M3M））; 
  

I am currently working on a php project and need to format a DateInterval as ISO8601 (something like this):

P5D

This format can be used to create DateTime and DateInterval objects, but I can't figure out a way to format a DateInterval into this format. Is there any? If not, what might be a lightweight solution to that?

解决方案

Well, if you look at the spec for the format when you construct one:

Y years

M months

D days

W weeks. These get converted into days, so can not be combined with D.

H hours

M minutes

S seconds

Then look at what you have to work with (http://php.net/manual/en/dateinterval.format.php), it seems like what you would do is:

$dateInterval = new DateInterval( /* whatever */ );
$format = $dateInterval->format("P%yY%mM%dD%hH%iM%sS");
//P0Y0M5D0H0M0S
//now, we need to remove anything that is a zero, but make sure to not remove
//something like 10D or 20D
$format = str_replace(["M0S", "H0M", "D0H", "M0D", "Y0M", "P0Y"], ["M", "H", "D", "M", "Y0M", "P"], $format);
echo $format;
//P0M5D

Now, the one thing I did differently is I always include the months, even if it is 0. The reason for this is that minutes and months are both represented by M - if we always include the month, then if there is a minute we know it is minutes. Otherwise we have to do a bunch of logic to see if we need to change the P to PT so it knows that the a M in this instance stands for Minute.

For example:

// For 3 Months
new DateInterval("P3M");
// For 3 Minutes
new DateInterval("PT3M"));

But instead we do:

// For 3 Months
new DateInterval("P3M");
// For 3 Minutes
new DateInterval("P0M3M"));

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