add($interval);

    $period = new DatePeriod(
         new DateTime($start),
         $interval,
         $realEnd
    );

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

    return $array;
}

// Call the function
$dates = getDatesFromRange('2015-10-01', '2015-12-05');

// Print the output
print_r($dates);

Array
(
    [0] => 2015-10-01
    [1] => 2015-10-02
    [2] => 2015-10-03
    [3] => 2015-10-04
    [4] => 2015-10-05
    [5] => 2015-10-06
    [6] => 2015-10-07
    [7] => 2015-10-08
    [8] => 2015-10-09
    [9] => 2015-10-10
    [10] => 2015-10-11
    [11] => 2015-10-12
    [12] => 2015-10-13
    [13] => 2015-10-14
    [14] => 2015-10-15
    [15] => 2015-10-16
    [16] => 2015-10-17
    [17] => 2015-10-18
    [18] => 2015-10-19
    [19] => 2015-10-20
    [20] => 2015-10-21
    [21] => 2015-10-22
    [22] => 2015-10-23
    [23] => 2015-10-24
    [24] => 2015-10-25
    [25] => 2015-10-26
    [26] => 2015-10-27
    [27] => 2015-10-28
    [28] => 2015-10-29
    [29] => 2015-10-30
    [30] => 2015-10-31
    [31] => 2015-11-01
    [32] => 2015-11-02
    [33] => 2015-11-03
    [34] => 2015-11-04
    [35] => 2015-11-05
    [36] => 2015-11-06
    [37] => 2015-11-07
    [38] => 2015-11-08
    [39] => 2015-11-09
    [40] => 2015-11-10
    [41] => 2015-11-11
    [42] => 2015-11-12
    [43] => 2015-11-13
    [44] => 2015-11-14
    [45] => 2015-11-15
    [46] => 2015-11-16
    [47] => 2015-11-17
    [48] => 2015-11-18
    [49] => 2015-11-19
    [50] => 2015-11-20
    [51] => 2015-11-21
    [52] => 2015-11-22
    [53] => 2015-11-23
    [54] => 2015-11-24
    [55] => 2015-11-25
    [56] => 2015-11-26
    [57] => 2015-11-27
    [58] => 2015-11-28
    [59] => 2015-11-29
    [60] => 2015-11-30
    [61] => 2015-12-01
    [62] => 2015-12-02
    [63] => 2015-12-03
    [64] => 2015-12-04
    [65] => 2015-12-05
)