解析并创建ISO 8601日期和时间间隔，如PHP中的PT15M [英] Parse and create ISO 8601 Date and time intervals, like PT15M in PHP
问题描述
示例间隔值为：
- PT1M或PT60S（1分钟）
- PT1H，PT60M或PT3600S（1小时）
我需要两个功能：从这些值解析为秒： iso8601_interval_to_seconds（），从秒到这样的间隔： iso8601_interval_from_seconds（）。
后者相当简单，因为它可以做为PT {$ seconds} S，只是随着秒数传递。也许这可以更好的解析器切换到H（小时）或M（分钟）？
第一个更难，但也许PHP中有许多字符串转换器之一呢？我很乐意学习如何使用这样的函数来解析间隔。或者学习一个选择。
看起来像PHP 5.3的 DateInterval 支持这一点。
如果您不能使用5.3，我认为任何这样的转换功能将知道一年，一个月，一天，一小时和一个小时内有多少秒分钟。然后，当从秒转换时，它将以该顺序分割，每次以前一次操作的模数，直到只剩下<60秒。当从ISO 8601间隔表示转换时，解析字符串应该是微不足道的，并相应地乘以每个找到的元素。
A library and webservice I am using, communicates time-intervals in ISO 8601: PnYnMnDTnHnMnS. I want to convert such formats to seconds. And vice versa. Seconds are a lot easier to calculate with.
Example interval values are:
- PT1M or PT60S (1 minute)
- PT1H, PT60M or PT3600S (1 hour)
I need two functions: parse from such values to seconds: iso8601_interval_to_seconds() and from seconds into such intervals: iso8601_interval_from_seconds().
The latter is rather simple, because it could be done as `"PT{$seconds}S", just pass seconds along, at all times. Maybe this can be done nicer with a parser that switches to H(hour) or M(minute)?
The first is harder, but maybe there is a trick with one of the many string-to-date converters in PHP? I would love to learn how to use such a function for parsing intervals. Or learn an alternative.
It looks like PHP 5.3's DateInterval supports this.
If you can't use 5.3, I suppose any such conversion function would know how many seconds are in a year, a month, a day, an hour, and a minute. Then, when converting from seconds, it would divide in that order, each time taking the modulo of the previous operation, until only <60 seconds are left. When converting from an ISO 8601 interval representation it should be trivial to parse the string and multiply each found element accordingly.
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