getting last date of month in php code example

Example 1: get last month php

$currentMonth = date('M');// if number, then date('m');
//Last month
$lastMonth = Date("F", strtotime("first day of previous month");
$nextMonth = Date("F", strtotime("first day of next month");

Example 2: check if is the last day of the month php

if(gmdate('t') == gmdate('d')){
    echo 'Last day of the month.';
}