Get dates between two dates.

datesBetween.php

<?php

function datesBetween($start, $end, $format = 'Ymd')
{
    $output = array();

    $startDate = date($format, strtotime($start));
    $endDate = date($format, strtotime($end));

    $output[] = $startDate;

    while ( $startDate < $endDate )
    {
        $startDate = date($format, strtotime('+1 day', strtotime($startDate)));
        $output[] = $startDate;
    }

    return $output;
}

var_dump(datesBetween('20130801', '20130902'));