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$from = new \DateTime('2014-01-01');
$to = new \DateTime('2015-11-01');

$period = new \DatePeriod($from, new \DateInterval('P1D'), $to);

$arrayOfDates = array_map(
    function ($item) {
        return $item->format('Y-m-d');
    },
    iterator_to_array($period)
);