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run code in 150+ php & hhvm versions
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<?php $startYear = 2014; $lastTaken = 2014; $recurrenceYears = 3; $nextRequirement = $lastTaken+ (($lastTaken - $startYear) % $recurrenceYears); var_dump($nextRequirement);
based on TrBHS
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(2014)
Output for hhvm-3.10.0

Process exited with code 153.