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<?php interface FooInterface { public function test(\StdClass $objec); } class Foo implements FooInterface { public function test(\StdClass $object) { } } class Bar extends Foo { public function test(\DateTime $object) { echo 'yes'; } } $bar = new Bar(); $bar->test(new \DateTime());
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Declaration of Bar::test(DateTime $object) must be compatible with Foo::test(StdClass $object) in /in/NrKJP on line 14
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Declaration of Bar::test(DateTime $object) must be compatible with Foo::test(StdClass $object) in /in/NrKJP on line 13
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Fatal error: Declaration of Bar::test(DateTime $object) must be compatible with FooInterface::test(StdClass $objec) in /in/NrKJP on line 13
Process exited with code 255.
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Declaration of Bar::test() must be compatible with FooInterface::test(StdClass $objec) in /in/NrKJP on line 13
Process exited with code 255.

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