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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(is_nan('1e9999999999999999999999999999999999'));
based on MURse
Output for 5.2.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.2.0
Notice: A non well formed numeric value encountered in /in/UN6RX on line 3 bool(false)
Output for 4.3.0 - 5.0.5
Warning: is_nan() expects parameter 1 to be double, string given in /in/UN6RX on line 3 NULL