3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo TRUE; echo true; define("true",false); echo true; echo TRUE;
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.2.0
11 Notice: Constant true already defined in /in/Tk3uL on line 4 11
Output for 4.3.7 - 4.3.8, 5.0.0
11 Notice: Constant already defined in /in/Tk3uL on line 4 11