3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function sum($a): ?void { return null; } sum(0);
based on F4TBE
Output for 7.1.0 - 7.1.7
Fatal error: Void type cannot be nullable in /in/cI7Hl on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?' in /in/cI7Hl on line 3
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: Syntax only allowed in Hack files (<?hh) or with -v Eval.EnableHipHopSyntax=true in /in/cI7Hl:3 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Parse error: syntax error, unexpected ':', expecting '{' in /in/cI7Hl on line 3
Process exited with code 255.