3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php ${0x0} = 'hello'; echo $NULL;
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: NULL in /in/Z4vqg on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: NULL in /in/Z4vqg on line 4