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run code in 200+ php & hhvm versions
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<?php var_dump(null < 0); var_dump(null == 0); var_dump(null > 0);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.9
bool(false) bool(true) bool(false)