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run code in 200+ php & hhvm versions
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<?php define("true", false);define("false", true); if (true == false) { echo "hi"; }
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/L2M1X on line 3 Notice: Constant false already defined in /in/L2M1X on line 3
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/L2M1X on line 3 Notice: Constant already defined in /in/L2M1X on line 3