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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, false, 1 === 1, 1 === 0 );
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.1.0
Notice: Constant true already defined in /in/ZgajG on line 3 Notice: Constant false already defined in /in/ZgajG on line 4 bool(true) bool(false) bool(true) bool(false)
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/ZgajG on line 3 Notice: Constant already defined in /in/ZgajG on line 4 bool(true) bool(false) bool(true) bool(false)