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<?php var_dump(NAN < 0); $x=NAN; var_dump($x < 0);
Output for 5.6.0 - 5.6.40, 7.0.23 - 7.0.33, 7.1.9 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.10, 8.0.0alpha1 - beta3
bool(false) bool(false)
Output for 7.0.0 - 7.0.22, 7.1.0 - 7.1.8
bool(true) bool(false)