PHP

php get total amount of days in month

$DaysInCurrentMonth = date('t');

php days in month

// For given month
echo cal_days_in_month(CAL_GREGORIAN, 1, 2021);
// For current month
echo date('t');

php calculate days of a month

cal_days_in_month(CAL_GREGORIAN, $month, $year)

get month days in php

echo cal_days_in_month(CAL_GREGORIAN, 8, 2009);