(PHP 5 >= 5.5.0, PHP 7)
IntlGregorianCalendar::isLeapYear — Determine if the given year is a leap year
public IntlGregorianCalendar::isLeapYear ( int $year ) : bool
This function is currently not documented; only its argument list is available.
year
Returns true for leap years, false otherwise and on failure.
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https://www.php.net/manual/en/intlgregoriancalendar.isleapyear.php