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<?php $start = (new DateTime('2010-12-02'))->modify('first day of this month'); $end = (new DateTime('2012-05-06'))->modify('first day of this month'); $interval = DateInterval::createFromDateString('1 month'); $period = new DatePeriod($start, $interval, $end); $months = array(); foreach ($period as $dt) { $months[] = $dt->format("Y-m"); } print_r($months);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 2010-12 [1] => 2011-01 [2] => 2011-02 [3] => 2011-03 [4] => 2011-04 [5] => 2011-05 [6] => 2011-06 [7] => 2011-07 [8] => 2011-08 [9] => 2011-09 [10] => 2011-10 [11] => 2011-11 [12] => 2011-12 [13] => 2012-01 [14] => 2012-02 [15] => 2012-03 [16] => 2012-04 )

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