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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 git.master, git.master_jit, rfc.property-hooks
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.

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