<?php $thirtyOnedayMonths = array( 1, 3, 5, 7, 8, 10, 12 ); $format = 'Y-m-d'; foreach($thirtyOnedayMonths as $month){ $date = date($format, strtotime('-1 month', strtotime("2013-{$month}-31 00:00:01"))); var_dump($date); }
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