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<?php var_dump(NAN == NAN); var_dump(NAN === NAN);
Output for 4.3.6 - 7.1.0
bool(false) bool(false)
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5vGCE on line 2 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5vGCE on line 2 bool(true) Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5vGCE on line 3 Notice: Use of undefined constant NAN - assumed 'NAN' in /in/5vGCE on line 3 bool(true)