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run code in 200+ php & hhvm versions
Bugs & Features
<?php define("true", false); define("false", true); define("null", true); if (true) { echo "TRUE"; } else { echo "FALSE"; }
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.1.7, 7.2.0
Notice: Constant true already defined in /in/v8AOJ on line 3 Notice: Constant false already defined in /in/v8AOJ on line 4 Notice: Constant null already defined in /in/v8AOJ on line 5 TRUE
Output for 7.1.10

Process exited with code 137.
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/v8AOJ on line 3 Notice: Constant already defined in /in/v8AOJ on line 4 Notice: Constant already defined in /in/v8AOJ on line 5 TRUE