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<?php class A {} var_dump(is_nan(NAN));
based on UD1io
Output for 4.3.6 - 7.1.10
bool(true)
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/tAaOC on line 4 Warning: is_nan() expects parameter 1 to be double, string given in /in/tAaOC on line 4 NULL