3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php declare(strict_types=1); function testParam(?string $arg = null){ var_dump($arg); } testParam(null); testParam("hi"); testParam();
based on Y5rn6
Output for 7.1.0 - 7.3.0rc3
NULL string(2) "hi" NULL
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/OlWg5 on line 5
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/OlWg5:5 Stack trace: #0 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Warning: Unsupported declare 'strict_types' in /in/OlWg5 on line 3 Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/OlWg5 on line 5
Process exited with code 255.