3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo {} abstract class Bar { public abstract function test(Foo $foo); } class Baz extends Bar { public function test($foo) { var_dump($foo); } } $f = new Foo(); $z = new Baz(); $z->test($f); $z->test(true);
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Foo)#1 (0) { } bool(true)
Output for 5.4.0 - 5.4.28
Fatal error: Declaration of Baz::test() must be compatible with Bar::test(Foo $foo) in /in/Qedct on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Fatal error: Declaration of Baz::test() must be compatible with that of Bar::test() in /in/Qedct on line 5
Process exited with code 255.
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