3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo(string $str = null) { var_dump($str); } foo(null); foo('bar');
based on 1AJ8B
Output for 7.0.0 - 7.2.0
NULL string(3) "bar"
Output for 5.3.19 - 5.6.28
NULL Catchable fatal error: Argument 1 passed to foo() must be an instance of string, string given, called in /in/fG7Hj on line 8 and defined in /in/fG7Hj on line 3
Process exited with code 255.