3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php //namespace Foo; define('null', true); var_dump(null);
Output for 4.3.0 - 4.3.6, 4.3.9 - 4.4.9, 5.0.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Constant null already defined in /in/f1ETn on line 5 NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.7 - 4.3.8, 5.0.0
Notice: Constant already defined in /in/f1ETn on line 5 NULL