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@ 2014-10-30T16:45:17Z

<?php

$startYear = 2014;
$currentYear = 2012;
$lastTaken = 2012;
$recurrenceYears = 3;

$useYear = MAX($startYear, MIN($currentYear, $lastTaken));


$nextRequirement = $useYear + ($recurrenceYears - (($useYear - $startYear) % $recurrenceYears));

echo $nextRequirement;

Output
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max: documentation ( source)
min: documentation ( source)

preferences:dark modelive preview

48.99 ms | 402 KiB | 5 Q