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run code in 150+ php & hhvm versions
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<?php define("TRUE", false); define("FALSE", true); var_dump(TRUE, true, FALSE, false);
Output for 5.1.3 - 7.1.0
bool(true) bool(true) bool(false) bool(false)
Output for 4.3.0 - 5.1.2
bool(false) bool(true) bool(true) bool(false)