(PHP 5.5.0, PECL >= 3.0.0a1)
IntlCalendar::getActualMaximum — The maximum value for a field, considering the objectʼs current time
$field
)Returns a fieldʼs relative maximum value around the current time. The exact semantics vary by field, but in the general case this is the value that would be obtained if one would set the field value into the smallest relative maximum for the field and would increment it until reaching the global maximum or the field value wraps around, in which the value returned would be the global maximum or the value before the wrapping, respectively.
For instance, in the gregorian calendar, the actual maximum value for the day of month would vary between 28 and 31, depending on the month and year of the current time.
field
One of the IntlCalendar date/time field constants. These are integer
values between 0 and
IntlCalendar::FIELD_COUNT.
An int representing the maximum value in the units associated
with the given field 或者在失败时返回 FALSE.
Example #1 IntlCalendar::getActualMaximum()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
$cal = IntlCalendar::fromDateTime('2013-02-15');
var_dump($cal->getActualMaximum(IntlCalendar::FIELD_DAY_OF_MONTH)); //28
$cal->add(IntlCalendar::FIELD_EXTENDED_YEAR, -1);
var_dump($cal->getActualMaximum(IntlCalendar::FIELD_DAY_OF_MONTH)); //29
以上例程会输出：
int(28) int(29)