<?php

function some_func($from, $to) {
    $period = new DatePeriod(
        new DateTime($from),
        new DateInterval('P1D'),
        (new DateTime($to))->modify('+1 day')
    );

    $dates = [];
    foreach ($period as $date) {
        $dates[] = $date->format('Y-m-d');
    }
    return $dates;
}

print_r(some_func('2016-09-28', '2016-11-23'));