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<?php $start_date = '2014-01-01'; $end_date = '2015-01-31'; $date_regex = "/^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/"; if (!empty($start_date) & !empty($end_date) && preg_match($date_regex, $start_date) && preg_match($date_regex, $end_date)) { $start = new \DateTime($start_date); $end = new \DateTime($end_date); $now = new \DateTime(); $intervals = []; while ($start <= $end) { $first_day = $start->format('Y-m-d'); if ( $start->format('Y-m') === $now->format('Y-m') ) { $last_day = $now->format('Y-m-d'); } else { $last_day = date('Y-m-t', strtotime($start->format('Y-m'))); } $intervals[ $first_day ] = $last_day; $start->modify('first day of next month'); } echo '<pre>';print_r($intervals); }

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