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<?php interface Foo {} class Bar {} class Qux implements Foo {} $bars = [new Bar(), new Bar()]; $quxs = [new Qux(), new Qux()]; usort($bars, function(Foo $a, Foo $b) { return 0; }); var_dump($bars);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: {closure}(): Argument #1 ($a) must be of type Foo, Bar given in /in/KAZtp:12 Stack trace: #0 [internal function]: {closure}(Object(Bar), Object(Bar)) #1 /in/KAZtp(12): usort(Array, Object(Closure)) #2 {main} thrown in /in/KAZtp on line 12
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, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to {closure}() must implement interface Foo, instance of Bar given in /in/KAZtp:12 Stack trace: #0 [internal function]: {closure}(Object(Bar), Object(Bar)) #1 /in/KAZtp(12): usort(Array, Object(Closure)) #2 {main} thrown in /in/KAZtp on line 12
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Catchable fatal error: Argument 1 passed to {closure}() must implement interface Foo, instance of Bar given in /in/KAZtp on line 12
Process exited with code 255.
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