PHP - Get days of month

getdaysofmonth.php

function GetDaysOfMonth($year, month){
    $start_date = "01-".$month."-".$year;
    $start_time = strtotime($start_date);
    $end_time = strtotime("+1 month", $start_time);

    for($i=$start_time; $i<$end_time; $i+=86400) {
        $list[] = date('Y-m-d', $i);
    }

    return $list;
}