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run code in 150+ php & hhvm versions
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<?php define('TRUE', false); define('true', false); define('TRue', false); var_dump(TRUE, true, TRue);
Output for 5.1.3 - 5.6.28, 7.0.0 - 7.1.0
Notice: Constant true already defined in /in/mLfnC on line 3 bool(true) bool(true) bool(true)
Output for hhvm-3.12.0
Notice: Constant TRUE already defined in /in/mLfnC on line 2 Notice: Constant true already defined in /in/mLfnC on line 3 bool(true) bool(true) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 5.1.2
Notice: Constant true already defined in /in/mLfnC on line 3 bool(false) bool(true) bool(false)
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/mLfnC on line 3 bool(false) bool(true) bool(false)