IntlGregorianCalendar::isLeapYear
  (PHP 5 >= 5.5.0, PHP 7, PHP 8)
IntlGregorianCalendar::isLeapYear — Determine if the given year is a leap year
  
 
  说明
  
   public IntlGregorianCalendar::isLeapYear(
int $year): 
bool 
  
  
  
 
 
  返回值
  
   Returns true for leap years, false otherwise and on failure.