(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
cal_days_in_month — Return the number of days in a month for a given year and calendar
$calendar, int $month, int $year): int
This function will return the number of days in the
month of year for
the specified calendar.
calendarCalendar to use for calculation
monthMonth in the selected calendar
yearYear in the selected calendar
The length in days of the selected month in the given calendar
Example #1 cal_days_in_month() example
<?php
$number = cal_days_in_month(CAL_GREGORIAN, 8, 2003); // 31
echo "There were {$number} days in August 2003";
?>