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run code in 200+ php & hhvm versions
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<?php define('true', 7); define('false', -6); var_dump(true, false);
based on RWfK1
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.2.0
Notice: Constant true already defined in /in/COekf on line 3 Notice: Constant false already defined in /in/COekf on line 4 bool(true) bool(false)
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/COekf on line 3 Notice: Constant already defined in /in/COekf on line 4 bool(true) bool(false)