$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");
$first_day_this_month = date('m-01-Y'); // hard-coded '01' for first day
$last_day_this_month = date('m-t-Y');
//Last month
$lastMonth = Date("F", strtotime("first day of previous month");
$nextMonth = Date("F", strtotime("first day of next month");
$lastOfMonth = date('Y-m-t');