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@ 2018-10-26T07:07:26Z

<?php

    $now = new DateTimeImmutable('now');
    $months = [];
    $monthcnt = 0;
      for ($i = 1; $i <= 12; $i++) {
           if (($i % 3) == 0) {
               $monthcnt += 3;
               $minus = '-' . $monthcnt . ' months';
               $pq3 = $now->modify($minus);
               var_dump($pq3->format('m'));
            //   switch ($pq3->format('m')) 
             //   case 
               var_dump($pq3->format('Y'));

           }
        }

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

40.09 ms | 402 KiB | 5 Q