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<?php var_dump(NAN); //var_dump((int)INF); var_dump(INF == INF) ?>
Output for 5.4.0 - 7.1.0
float(NAN) bool(true)
Output for 4.3.6 - 5.3.29
float(NAN) bool(false)
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/Kj22V on line 2 string(3) "NAN" Notice: Use of undefined constant INF - assumed 'INF' in /in/Kj22V on line 4 Notice: Use of undefined constant INF - assumed 'INF' in /in/Kj22V on line 4 bool(true)