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(PHP 5 >= 5.5.0, PHP 7, PHP 8, PECL >= 3.0.0a1)
IntlCalendar::fieldDifference — Calculate difference between given time and this objectʼs time
面向对象风格
$timestamp, int $field): int|false
过程化风格
Return the difference between the given time and the time this object is
set to, with respect to the quantity specified the
field parameter.
This method is meant to be called successively, first with the most significant field of interest down to the least significant field. To this end, as a side effect, this calendarʼs value for the field specified is advanced by the amount returned.
calendar
IntlCalendar 实例。
timestamp
The time against which to compare the quantity represented by the
field. For the result to be positive, the time
given for this parameter must be ahead of the time of the object the
method is being invoked on.
field
The field that represents the quantity being compared.
One of the IntlCalendar date/time field constants. These are integer
values between 0 and
IntlCalendar::FIELD_COUNT.
Returns a (signed) difference of time in the unit associated with the
specified field 或者在失败时返回 false.
示例 #1 IntlCalendar::fieldDifference()
<?php
ini_set('date.timezone', 'Europe/Lisbon');
ini_set('intl.default_locale', 'fr_FR');
$cal1 = IntlCalendar::fromDateTime('2012-02-29 09:00:11');
$cal2 = IntlCalendar::fromDateTime('2013-03-01 09:19:29');
$time = $cal2->getTime();
echo "Time before: ", IntlDateFormatter::formatObject($cal1), "\n";
printf(
"The difference in time is %d year(s), %d month(s), "
. "%d day(s), %d hour(s) and %d minute(s)\n",
$cal1->fieldDifference($time, IntlCalendar::FIELD_YEAR),
$cal1->fieldDifference($time, IntlCalendar::FIELD_MONTH),
$cal1->fieldDifference($time, IntlCalendar::FIELD_DAY_OF_MONTH),
$cal1->fieldDifference($time, IntlCalendar::FIELD_HOUR_OF_DAY),
$cal1->fieldDifference($time, IntlCalendar::FIELD_MINUTE)
);
//now it was advanced to the target time, exception for the seconds,
//for which we did not measure the difference
echo "Time after: ", IntlDateFormatter::formatObject($cal1), "\n";
以上例程会输出：
Time before: 29 févr. 2012 09:00:11 The difference in time is 1 year(s), 0 month(s), 1 day(s), 0 hour(s) and 19 minute(s) Time after: 1 mars 2013 09:19:11
