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run code in 150+ php & hhvm versions
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<?php define('TRUE', 0); if (TRUE) { echo "TUE"; } else { echo "FALSE!!!"; }
Output for 5.1.3 - 5.6.28, 7.0.0 - 7.1.0
TUE
Output for hhvm-3.10.0 - 3.13.2
Notice: Constant TRUE already defined in /in/pG3kN on line 2 TUE
Output for 4.3.0 - 5.1.2
FALSE!!!