<?php

function gunleriBul($startTime, $endTime) {
    $day = 86400;
    $format = 'Y-m-d';
    $startTime = strtotime($startTime);
    $endTime = strtotime($endTime);
    $numDays = round(($endTime - $startTime) / $day) + 1;
    $days = array();

    for ($i = 0; $i < $numDays; $i++) {
        $days[] = date($format, ($startTime + ($i * $day)));
    }

    return $days;
}

$basla = '2012-03-21';
$bitis = '2012-05-03';

$days = gunleriBul($basla, $bitis);

foreach($days as $key => $value){

    echo $value . '<br> ';

}

/*
2012-03-21
2012-03-22
2012-03-23
2012-03-24
2012-03-25
2012-03-26
2012-03-27
2012-03-28
2012-03-29
2012-03-30
2012-03-31
2012-04-01
2012-04-02
2012-04-03
2012-04-04
2012-04-05
2012-04-06
2012-04-07
2012-04-08
2012-04-09
2012-04-10
2012-04-11
2012-04-12
2012-04-13
2012-04-14
2012-04-15
2012-04-16
2012-04-17
2012-04-18
2012-04-19
2012-04-20
2012-04-21
2012-04-22
2012-04-23
2012-04-24
2012-04-25
2012-04-26
2012-04-27
2012-04-28
2012-04-29
2012-04-30
2012-05-01
2012-05-02
2012-05-03
*/
 ?>