PHP计算近1年的所有月份

$z = date('Y-m');$a = date('Y-m', strtotime('-12 months'));$begin = new DateTime($a);$end = new DateTime($z);$end = $end->modify('+1 month');$interval = new DateInterval('P1M');$daterange = new DatePeriod($begin, $interval ,$end);foreach($daterange as $date){   echo $date->format("Y-m") . "<br />";}