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run code in 150+ php & hhvm versions
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<?php define('FALSE', 0); if (FALSE) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
FALSE!!!
Output for hhvm-3.10.0 - 3.12.0
Notice: Constant FALSE already defined in /in/MsROB on line 2 FALSE!!!