3v4l.org

run code in 150+ php & hhvm versions
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<?php define("true",false); if (true) { echo "TRUE"; } else { echo "FALSE!!!"; }
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Constant true already defined in /in/qJLV9 on line 2 TRUE
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/qJLV9 on line 2 TRUE