3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php define('TEST','kitty'); echo TEST; define('TEST','dog'); echo TEST;
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 7.1.0
kitty Notice: Constant TEST already defined in /in/v7TTW on line 4 kitty
Output for 4.3.7 - 4.3.8, 5.0.0
kitty Notice: Constant already defined in /in/v7TTW on line 4 kitty