- print_r: documentation ( source)
<?php
$start_date = '2013-10-01';
$end_date = '2013-10-03';
$period = array();
$begin = new DateTime($start_date);
$end = new DateTime($end_date);
while($begin <= $end) {
$period[] = $begin->format('Y-m-d');
$begin->modify('+1 day');
}
print_r($period);