3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function foo(): void {} public function bar(?string $string): ?bool {} }
Output for 8.1.23 - 8.1.27, 8.2.10 - 8.2.17, 8.3.0 - 8.3.4
Output for 7.1.0 - 7.1.6
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Foo has a deprecated constructor in /in/nCVrF on line 3 Fatal error: Constructor Foo::foo() cannot declare a return type in /in/nCVrF on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/nCVrF on line 5
Process exited with code 255.

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