3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function bar(): void {} public function baz(): null {} public function lor(?string $string): ?bool {} }
Output for 7.1.0 - 7.1.6
Fatal error: Cannot use 'null' as class name as it is reserved in /in/F2uvK on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/F2uvK on line 6
Process exited with code 255.
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