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<?php class A {} class B extends A {} class Foo { public function test(B $a) { var_dump(get_class($a)); } } class Bar extends Foo { public function test(A $a) { parent::test($a); } } (new Foo)->test(new A); (new Foo)->test(new B); (new Bar)->test(new A); (new Bar)->test(new B);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught TypeError: Foo::test(): Argument #1 ($a) must be of type B, A given, called in /in/dHDQt on line 16 and defined in /in/dHDQt:6 Stack trace: #0 /in/dHDQt(16): Foo->test(Object(A)) #1 {main} thrown in /in/dHDQt on line 6
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught TypeError: Foo::test(): Argument #1 ($a) must be of type B, A given, called in /in/dHDQt on line 16 and defined in /in/dHDQt:6 Stack trace: #0 /in/dHDQt(16): Foo->test(Object(A)) #1 {main} thrown in /in/dHDQt on line 6
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to Foo::test() must be an instance of B, instance of A given, called in /in/dHDQt on line 16 and defined in /in/dHDQt:6 Stack trace: #0 /in/dHDQt(16): Foo->test(Object(A)) #1 {main} thrown in /in/dHDQt on line 6
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of Bar::test(A $a) should be compatible with Foo::test(B $a) in /in/dHDQt on line 14 Fatal error: Uncaught TypeError: Argument 1 passed to Foo::test() must be an instance of B, instance of A given, called in /in/dHDQt on line 16 and defined in /in/dHDQt:6 Stack trace: #0 /in/dHDQt(16): Foo->test(Object(A)) #1 {main} thrown in /in/dHDQt on line 6
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Strict Standards: Declaration of Bar::test() should be compatible with Foo::test(B $a) in /in/dHDQt on line 14 Catchable fatal error: Argument 1 passed to Foo::test() must be an instance of B, instance of A given, called in /in/dHDQt on line 16 and defined in /in/dHDQt on line 6
Process exited with code 255.

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