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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump((float)NAN - -NAN);
based on TOOjF
Output for 4.3.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
float(NAN)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.4 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3 float(NAN)
Output for 4.3.3
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3
Process exited with code 137.
Output for 4.3.0 - 4.3.2
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/NcOSr on line 3 float(0.E+79)