3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php declare(strict_types=1); function foo(string $bar = null) { var_dump($bar); } foo('');
based on sqmgJ
Output for 7.0.0 - 7.2.0
string(0) ""
Output for 5.3.21 - 5.6.28
Warning: Unsupported declare 'strict_types' in /in/n99Qv on line 1 Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in /in/n99Qv on line 7 and defined in /in/n99Qv on line 3
Process exited with code 255.