<?php
function setDate($needDays = 2) {
    $currentDate = time();
    $month = date("m", $currentDate);
    $year = date("Y", $currentDate);
    $randomArray = [];
    $firstDayOfMonth = "";
    for($i=0;$i<=$needDays;$i++){
        if($i<$needDays){
            // GO TO PAST
            if($month < 1){
                $month = 12;
                $year -= 1;
            }
            $firstDayOfMonth = "01-".$month."-".$year;
            $month -= 1;
            $unixFDOM = strtotime($firstDayOfMonth);
        }elseif($i==$needDays){
            $month = date("m", $currentDate);
            $year = date("Y", $currentDate);
        }else{
            // GO TO FUTURE
            if($month > 12){
                $month = 1;
                $year += 1;
            }
            $firstDayOfMonth = "01-".$month."-".$year;
            $month += 1;
            $unixFDOM = strtotime($firstDayOfMonth);
        }
        $randomArray[] = rand($unixFDOM, $unixFDOM + (28*24*60*60));
    }
    return $randomArray;
}
// print_r(setDate(2));
$setDate = setDate(14);
foreach($setDate as $date) {
    print_r($date);
    echo "<hr>";
}
// print_r($setDate[5]);
?>