3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php define("true", false); if (true) { echo "TRUE"; } else { echo "FALSE"; } echo "\nNow redefine TRUE..\n"; define("TRUE", false); if (TRUE) { echo "TRUE"; } else { echo "FALSE"; }
Output for 5.1.3 - 7.1.0
Notice: Constant true already defined in /in/1RaU1 on line 3 TRUE Now redefine TRUE.. TRUE
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 5.1.2
Notice: Constant true already defined in /in/1RaU1 on line 3 TRUE Now redefine TRUE.. FALSE
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/1RaU1 on line 3 TRUE Now redefine TRUE.. FALSE