3v4l.org

run code in 300+ PHP versions simultaneously
<?php $start = (new DateTime('1 year ago'))->modify('last day of this month'); $end = (new DateTime())->modify('last day of this month'); $interval = new DateInterval('P1M'); $period = new DatePeriod($start, $interval, $end); $months = array(); foreach ($period as $dt) { $months[$dt->format('Y-m-d')] = $dt->format('Y-m'); } $reverse_months = array_reverse($months); print_r($reverse_months);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [2021-01-02] => 2021-01 [2020-12-02] => 2020-12 [2020-11-02] => 2020-11 [2020-10-02] => 2020-10 [2020-09-02] => 2020-09 [2020-08-02] => 2020-08 [2020-07-02] => 2020-07 [2020-06-02] => 2020-06 [2020-05-02] => 2020-05 [2020-04-02] => 2020-04 [2020-03-02] => 2020-03 [2020-01-31] => 2020-01 )
preferences:
218.96 ms | 405 KiB | 383 Q