cal_days_in_month()

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

返回某个历法中某年中某月的天数

说明

该函数返回特定历法中的某年中的某月的天数。

参数

用来计算的某个历法

选定历法中的某月

选定历法中的某年

返回值

指定历法中选定的某月的天数。

范例

cal_days_in_month() example

Remember if you just want the days in the current month, use the date function:
$days = date("t");

Here's a one-line function I just wrote to find the numbers of days in a month that doesn't depend on any other functions.
The reason I made this is because I just found out I forgot to compile PHP with support for calendars, and a class I'm writing for my website's open source section was broken. So rather than recompiling PHP (which I will get around to tomorrow I guess), I just wrote this function which should work just as well, and will always work without the requirement of PHP's calendar extension or any other PHP functions for that matter.
I learned the days of the month using the old knuckle & inbetween knuckle method, so that should explain the mod 7 part. :)

Enjoy,
David Bindel

This will work great in future dates but will give the wrong answer for dates before 1550 (approx) when leap year was introduced and the calendar lost a year or two.
Sorry now to be more specific it has been a while sine I had to account for those later dates and had to take that into account but just a heads up for others to watch out.

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