how to get first and last date of month 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: get first day of current month php

<?php
    // First day of this month
    $d = new DateTime('first day of this month');
    echo $d->format('jS, F Y');
?>