3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface Baz { public function foo(string $param = null, int $bar); } class Foo { public function foo(string $param = null, int $bar) { var_dump($param, $bar); } } class Bar extends Foo implements Baz { public function foo(?string $param, int $bar) { parent::foo($param, $bar); } } (new Bar)->foo('a', 1); interface Qux { public function foo(?string $param, int $bar); } class Quux { public function foo(?string $param, int $bar) { var_dump($param, $bar); } } class Corge extends Quux implements Qux { public function foo(string $param = null, int $bar) { parent::foo($param, $bar); } } (new Corge)->foo('b', 2);
Output for 8.4.1 - 8.4.13
Deprecated: Baz::foo(): Implicitly marking parameter $param as nullable is deprecated, the explicit nullable type must be used instead in /in/USkgi on line 5 Deprecated: Foo::foo(): Implicitly marking parameter $param as nullable is deprecated, the explicit nullable type must be used instead in /in/USkgi on line 10 Deprecated: Corge::foo(): Implicitly marking parameter $param as nullable is deprecated, the explicit nullable type must be used instead in /in/USkgi on line 44 string(1) "a" int(1) string(1) "b" int(2)
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26
string(1) "a" int(1) string(1) "b" int(2)
preferences:
96.29 ms | 408 KiB | 5 Q