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(PHP 5 >= 5.5.0, PHP 7, PHP 8)
IntlGregorianCalendar::isLeapYear — Determine if the given year is a leap year
面向对象风格
过程化风格
Determines whether the given year is a leap year
in the Gregorian calendar.
calendarAn IntlGregorianCalendar instance.
yearThe year to check.
