3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php isset([$x => $y][0]); isset(($x));
Output for hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
Notice: Undefined variable: y in /in/gfIVa on line 3 Notice: Undefined variable: x in /in/gfIVa on line 3
Output for 5.6.0 - 5.6.30
Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /in/gfIVa on line 3
Process exited with code 255.