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run code in 150+ php & hhvm versions
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<?php $zizzle = NAN; if ($zizzle !== $zizzle) { echo 'wow'; }
based on d1UBR
Output for 4.3.6 - 7.1.0
wow
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/iCSMO on line 4