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<?php define('TRUE', false); var_dump(true); var_dump(TRUE); var_dump(constant('TRUE')); var_dump(constant('true'));
Output for 5.1.3 - 5.6.28, 7.0.0 - 7.1.0
bool(true) bool(true) bool(false) bool(true)
Output for hhvm-3.10.0 - 3.12.0
Notice: Constant TRUE already defined in /in/M1ZrQ on line 3 bool(true) bool(true) bool(true) bool(true)
Output for 4.3.0 - 5.1.2
bool(true) bool(false) bool(false) bool(true)