Online PHP editor | refs for kKrvC

@ 2014-10-30T17:27:25Z

<?php

$startYear = 2014;
$lastTaken = 2016;
$recurrenceYears = 3;

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

var_dump($nextRequirement);