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<?php $x = NAN; $y = NAN; var_dump($x != $y); var_dump(array($x => 1));
Output for hhvm-3.12.0, 7.0.0 - 7.1.0
bool(true) array(1) { [0]=> int(1) }
Output for 4.3.6 - 5.6.28, hhvm-3.10.0
bool(true) array(1) { [-9223372036854775808]=> int(1) }
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/iBjCG on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/iBjCG on line 4 bool(false) array(1) { ["NAN"]=> int(1) }