(PHP 4 >= 4.1.0, PHP 5, PHP 7)
cal_days_in_month — Return the number of days in a month for a given year and calendar
cal_days_in_month ( int $calendar , int $month , int $year ) : int
This function will return the number of days in the month of year for the specified calendar.
calendar
Calendar to use for calculation
month
Month in the selected calendar
year
Year 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";
?>
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https://www.php.net/manual/en/function.cal-days-in-month.php