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run code in 150+ php & hhvm versions
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<?php var_dump(NAN ? 'T' : 'F');
Output for 4.3.6 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(1) "T"
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/YDtqp on line 2 string(1) "T"