php - DateInterval 中的天数和 "d"属性有什么区别

Question

当我使用 DateInterval 类时，它返回一个名为“d”的属性，然后返回另一个名为“Days”的属性，我真的很困惑这两者之间的区别。有人可以解释一下吗。

下面是我的代码中返回的对象的示例。

DateInterval(
y =
0
m =
1
d =
1
h =
3
i =
16
s =
6
weekday =
0
weekday_behavior =
0
first_last_day_of =
0
invert =
1
days =
31
special_type =
0
special_amount =
0
have_weekday_relative =
0
have_special_relative =
0

Answer 1

• d - 添加月份后需要添加的从月初的天数 - (Feb 23 - Jan 1).d == 22)
• days - 总天数 - (Feb 23 - Jan 1).days == 31 + 22)

来自 the documentation :

d

Number of days.

days

If the DateInterval object was created by DateTime::diff(), then this is the total number of days between the start and end dates.Otherwise, days will be FALSE.

Before PHP 5.4.20/5.5.4 instead of FALSE you will receive -99999 uponaccessing the property.