(PHP 5 >= 5.5.0, PHP 7, PHP 8)
$timeZoneOrYear
,$localeOrMonth
,$dayOfMonth
,$hour
,$minute
,$second
= ?$year
,$month
,$dayOfMonth
,$hour
,$minute
,$second
= null
$timezone
= null
, ?string $locale
= null
): ?IntlCalendar$datetime
, ?string $locale
= null
): ?IntlCalendar$keyword
, string $locale
, bool $onlyCommon
): IntlIterator|false$year
,$month
,$dayOfMonth
= NULL,$hour
= NULL,$minute
= NULL,$second
= NULL