3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php declare(strict_types=1); function x(?string $x = null) { } x(null);
based on XBStu
Output for 7.1.0 - 7.3.0rc3
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/ddDiQ on line 4
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/ddDiQ:4 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Warning: Unsupported declare 'strict_types' in /in/ddDiQ on line 2 Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/ddDiQ on line 4
Process exited with code 255.