Answers for "first day of selected month in php"

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');
?>

get next month first day php

$config_month  = 1;
$config_day = 1;

$new_expiry_date = date('Y-m-d', mktime(0, 0, 0, date('m') + $config_month, 1 + $config_day, date('Y')));