<?php function round_to_four($number) { if($number <= 12) { $number = 12; } else { $number = ceil($number); if(!($number % 4 == 0)) $number += (4 - ($number % 4)); } return $number; } foreach(range(1, 21) as $i) { echo $i . ' => ' . round_to_four($i) . "\n"; }
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