Answers for "php month of the day"

first day of month php

$first_day = date('Y-m-01');   $last_day = date('Y-m-t');

php days in month

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

php last day of month

$a_date = "2009-11-23";
echo date("Y-m-t", strtotime($a_date));